A line chart showing mortgage-backed securities as a percentage of total assets among all commercial banks. The percentage was 8.1% in the first quarter 1991, 10.3% in third-quarter 1993, 8.9% in second-quarter 1995, 7.2% in second-quarter 1997, 8.4% in first-quarter 1999, 7.8% in first-quarter 2001, and 10.0% in third-quarter 2002.