U.S average is $10,600 per student in 2010. California average was $9,375. New York was $18,618. Lowest was Utah at $6,064.
Looks like for CA (before inflation adjustment in parens):
1992: $7684 ($4697), 2010: $9870 ($9375) = ~28%
And NY:
1992: $12267 ($7498), 2010: $19127 ($18618) = ~55%
EDIT: re-calculated using data directly from US Census Bureau (http://www.census.gov/govs/school/).
U.S average is $10,600 per student in 2010. California average was $9,375. New York was $18,618. Lowest was Utah at $6,064.