Reply #6: Here's a link to the historical data since 1950.

[napi21]

http://www.publicdebt.treas.gov/opd/opdhisto4.htm

Date Amount

09/30/2005 $7,932,709,661,723.50
09/30/2004 $7,379,052,696,330.32
09/30/2003 $6,783,231,062,743.62
09/30/2002 $6,228,235,965,597.16
09/30/2001 $5,807,463,412,200.06
09/30/2000 $5,674,178,209,886.86
09/30/1999 5,656,270,901,615.43
09/30/1998 5,526,193,008,897.62
09/30/1997 5,413,146,011,397.34
09/30/1996 5,224,810,939,135.73
09/29/1995 4,973,982,900,709.39
09/30/1994 4,692,749,910,013.32
09/30/1993 4,411,488,883,139.38
09/30/1992 4,064,620,655,521.66
09/30/1991 3,665,303,351,697.03
09/28/1990 3,233,313,451,777.25
09/29/1989 2,857,430,960,187.32
09/30/1988 2,602,337,712,041.16
09/30/1987 2,350,276,890,953.00
09/30/1986 2,125,302,616,658.42
12/31/1985 1,945,941,616,459.88
12/31/1984 1,662,966,000,000.00 *
12/31/1983 1,410,702,000,000.00 *
12/31/1982 1,197,073,000,000.00 *
12/31/1981 1,028,729,000,000.00 *
12/31/1980 930,210,000,000.00 *
12/31/1979 845,116,000,000.00 *
12/29/1978 789,207,000,000.00 *
12/30/1977 718,943,000,000.00 *
12/31/1976 653,544,000,000.00 *
12/31/1975 576,649,000,000.00 *
12/31/1974 492,665,000,000.00 *
12/31/1973 469,898,039,554.70
12/29/1972 449,298,066,119.00
12/31/1971 424,130,961,959.95
12/31/1970 389,158,403,690.26
12/31/1969 368,225,581,254.41
12/31/1968 358,028,625,002.91
12/29/1967 344,663,009,745.18
12/30/1966 329,319,249,366.68
12/31/1965 320,904,110,042.04
12/31/1964 317,940,472,718.38
12/31/1963 309,346,845,059.17
12/31/1962 303,470,080,489.27
12/29/1961 296,168,761,214.92
12/30/1960 290,216,815,241.68
12/31/1959 290,797,771,717.63
12/31/1958 282,922,423,583.87
12/31/1957 274,897,784,290.72
12/31/1956 276,627,527,996.11
12/30/1955 280,768,553,188.96
12/31/1954 278,749,814,391.33
12/31/1953 275,168,120,129.39
06/30/1953 266,071,061,638.57
06/30/1952 259,105,178,785.43
06/29/1951 255,221,976,814.93
06/30/1950 257,357,352,351.04

Asterisk indicates rounded to millions.