Large institutions, in particular, have seen narrowing net interest margins as the yield curve has flattened

Period Net Interest Margin (%)
Commercial banks and thrifts with total assets over $1 billion
Net Interest Margin (%)
Commercial banks and thrifts with total assets under $1 billion
1990 3.26 3.92
1991 3.63 4.05
1992 4.05 4.44
1993 4.10 4.45
1994 4.02 4.47
1995 3.92 4.39
1996 3.95 4.38
1997 3.94 4.41
1998 3.80 4.32
1999 3.80 4.29
2000 3.67 4.25
2001 3.72 4.10
2002 3.91 4.20
2003 3.68 4.01
2004 3.44 4.05
2005* 3.41 4.09

Source: FDIC *2Q Annualized