Fun with spreadsheets, Python, and gnuplot.
Taken from the site Wojtek earlier pointed out, an attempt to calculate expenditures per student, in constant dollars:
Year All Private Public 1969 14733 16581 10076 1970 14517 16472 9873 1971 14694 16801 9617 1972 15003 16907 9571 1973 14523 16783 9675 1974 14016 16857 9578 1975 13277 15992 8758 1976 13953 16266 9091 1977 13768 15890 8828 1978 13921 16367 9152 1979 13414 16604 9181 1980 12940 16403 8890 1981 12790 15916 8614 1982 13181 16210 8581 1983 13682 16639 8779 1984 14707 17458 9387 1985 15494 18298 9831 1986 16099 19665 10025 1987 16288 20621 10197 1988 16574 21093 10557 1989 16583 21638 10626 1990 16712 22665 10875 1991 16662 22860 10625 1992 16942 22983 10796 1993 17546 23558 11197 1994 18036 24110 11650 1995 18301 24547 11815 1996 18536 24407 12145 1997 18850 24180 12479 1998 19441 24315 13140 1999 20019 24884 13817 2000 20546 25245 14494 2001 20938 25727 14652 2002 21196 26308 14821 2003 21308 25747 14900 2004 21421 25221 15094 2005 21510 24915 15238 2006 21930 25284 15345 2007 22358 25577 16014 2008 23407 27585 15879
Graph at
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Michael J. Smith mjs at smithbowen.net http://stopmebeforeivoteagain.org http://fakesprogress.blogspot.com