Foreign investors have recently shown strong interest in U.S. bonds—Treasuries in particular

Period Trailing-Year Flows as a Percent of GDP; Net foreign purchases of U.S. Treasury bonds Trailing-Year Flows as aPercent of GDP; Net foreign purchases of U.S. agency bonds Trailing-Year Flows as a Percent of GDP; Net foreign purchases of U.S. corporate bonds
Dec/1977 1.117635916 0.130706573 0.073404054
Mar/1978 1.066 0.126604651 0.061627907
Jun/1978 0.797811566 0.094172965 0.048470733
Sep/1978 0.473889222 0.087663727 0.041520418
Dec/1978 0.194786926 0.052709971 0.042407944
Mar/1979 0.082575881 0.039360493 0.040577828
Jun/1979 0.105554676 0.032877038 0.033984808
Sep/1979 0.15042104 0.027146537 0.021801823
Dec/1979 0.107648938 0.020484871 0.022289043
Mar/1980 0.161890434 0.068616299 0.028327157
Jun/1980 0.166929249 0.063386216 0.06247023
Sep/1980 0.123196727 0.069547118 0.092155315
Dec/1980 0.167815146 0.087764407 0.098769241
Mar/1981 0.252858126 0.065155436 0.132538409
Jun/1981 0.320651998 0.084124567 0.118863217
Sep/1981 0.390851606 0.081354013 0.118727782
Dec/1981 0.470998623 0.048930046 0.108528344
Mar/1982 0.512834191 0.028680808 0.073804443
Jun/1982 0.51910445 0.024331576 0.086872051
Sep/1982 0.543800745 -0.007020328 0.064770161
Dec/1982 0.522538016 -0.010861694 0.054580014
Mar/1983 0.463271158 -0.021401756 0.041089006
Jun/1983 0.455698746 -0.035762464 0.012772308
Sep/1983 0.244476639 -0.029671524 0.012788009
Dec/1983 0.147111424 -0.000487752 0.02490245
Mar/1984 0.059376312 0.00947606 0.039137967
Jun/1984 0.067389858 0.013764519 0.030189838
Sep/1984 0.230179478 0.030516314 0.07214318
Dec/1984 0.532740381 0.02916037 0.290439264
Mar/1985 0.510960068 0.037723025 0.516154873
Jun/1985 0.739637182 0.051359372 0.630456634
Sep/1985 0.804918687 0.069274635 0.77319128
Dec/1985 0.675852654 0.100444259 0.920750613
Mar/1986 0.795261766 0.121670923 0.935379424
Jun/1986 0.707164968 0.149400095 1.093680096
Sep/1986 0.586239124 0.151872538 1.117781882
Dec/1986 0.426497437 0.153494204 0.956402191
Mar/1987 0.434825957 0.138150765 0.864861936
Jun/1987 0.408784648 0.114072495 0.721066098
Sep/1987 0.389299048 0.111246277 0.628486933
Dec/1987 0.523627284 0.103268322 0.454720341
Mar/1988 0.921605848 0.090369353 0.340253236
Jun/1988 0.971221458 0.120466935 0.332385241
Sep/1988 0.880853379 0.118913457 0.30408425
Dec/1988 0.929516341 0.128233435 0.404020024
Mar/1989 0.79335209 0.198058542 0.452646681
Jun/1989 0.591536642 0.179589666 0.394033846
Sep/1989 1.066396717 0.204649397 0.328946655
Dec/1989 0.970667765 0.270311409 0.30972548
Mar/1990 0.456651039 0.231474354 0.238436778
Jun/1990 0.479465995 0.222312296 0.24968522
Sep/1990 0.23896468 0.160221561 0.212038842
Dec/1990 0.306336342 0.10711599 0.165350157
Mar/1991 0.426936141 0.083474864 0.178464674
Jun/1991 0.546769948 0.08019382 0.196133662
Sep/1991 0.321658162 0.159304792 0.270445358
Dec/1991 0.325847305 0.168050133 0.277502543
Mar/1992 0.430706412 0.203418279 0.314068527
Jun/1992 0.454539673 0.285257786 0.331107614
Sep/1992 0.452221613 0.236439151 0.350286028
Dec/1992 0.605894237 0.282081335 0.320605154
Mar/1993 0.578446207 0.258761673 0.312974766
Jun/1993 0.336746268 0.290588467 0.314620166
Sep/1993 0.373595421 0.412549067 0.324678632
Dec/1993 0.346342755 0.520984677 0.449575012
Mar/1994 0.470380553 0.572420778 0.488843872
Jun/1994 0.508903934 0.519856058 0.530466816
Sep/1994 0.892636787 0.431532937 0.577476072
Dec/1994 1.089585465 0.299770471 0.525317331
Mar/1995 1.339325596 0.304659989 0.605675294
Jun/1995 1.914959729 0.308802486 0.631669324
Sep/1995 2.131658616 0.416867373 0.682323973
Dec/1995 1.782851446 0.381907611 0.769066135
Mar/1996 1.888957385 0.377828203 0.822247872
Jun/1996 1.729869094 0.399364761 0.883702389
Sep/1996 2.0013094 0.403562076 0.985927131
Dec/1996 2.902867357 0.521511424 1.046735163
Mar/1997 3.105154182 0.596465281 1.058455964
Jun/1997 3.30764569 0.617412489 1.084614079
Sep/1997 2.935778284 0.635583818 1.073205359
Dec/1997 2.174083955 0.588499858 0.995821135
Mar/1998 1.539532067 0.682019868 1.049576671
Jun/1998 1.213977985 0.749997112 1.252162765
Sep/1998 0.442801069 0.630627453 1.219181978
Dec/1998 0.547689249 0.634389868 1.361768188
Mar/1999 0.248604769 0.650122427 1.428628152
Jun/1999 -0.03940441 0.700395679 1.327399963
Sep/1999 0.349653728 0.87406453 1.606238256
Dec/1999 -0.104553811 0.968538264 1.684878407
Mar/2000 0.044519908 1.061634162 1.768396785
Jun/2000 -0.080435314 1.106945067 1.824673209
Sep/2000 -0.363553401 1.305036453 1.7674329
Dec/2000 -0.542838772 1.535544928 1.849863366
Mar/2001 -0.487062815 1.607014918 2.091583096
Jun/2001 -0.517933833 1.688396568 2.346720769
Sep/2001 -0.446685282 1.583309489 2.263223846
Dec/2001 0.181042997 1.603610299 2.170433099
Mar/2002 0.270310549 1.502520976 1.949657902
Jun/2002 0.556538085 1.638002801 1.886827921
Sep/2002 1.103738815 1.792797842 1.721184718
Dec/2002 1.132280877 1.842537602 1.721350946
Mar/2003 1.237062611 1.95101241 1.829513856
Jun/2003 1.92156465 1.900383601 1.854452907
Sep/2003 2.094305247 1.592663744 2.179627325
Dec/2003 2.363109648 1.386881452 2.365512638
Mar/2004 3.171203882 1.344170863 2.270443655
Jun/2004 3.393173383 1.382518579 2.202689845
Sep/2004 3.08600704 1.571123972 2.475318983
Dec/2004 2.934740563 1.887396625 2.587201547
Mar/2005 2.702700266 1.888079155 2.670902056
Jun/2005 2.209664514 1.784605313 2.844986301

Source: U.S. Department of the Treasury