What is the percentage increase in children under age 5 in the US
(states only, not territories, protectorates, etc.) between the
censuses of 1990 and 2000?

Hello relievebelarus,

According to the 1990 United States census, the overall population of
the country was 248,709,873. Of that number, 18,264,096 (7.34% of the
total population) were under five years old.
http://homer.ssd.census.gov/cdrom/lookup/1036089515=/1036089518=/1036089522=/1036089533=/CMD=RET/DB=C90STF3C1/F0=NATION/F1=STUB.GEO/FMT=HTML/LEV=NATION90/SEL=USA,United+States/T=P13

The 2000 census shows an overall population of 281,421,906, with
19,175,798 (6.81% of the total population) under five years old.
http://factfinder.census.gov/servlet/QTTable?ds_name=DEC_2000_SF1_U&geo_id=01000US&qr_name=DEC_2000_SF1_U_DP1

This is a relative decrease of .53% in the under-5 population
(percentage of under-5's in 1990 versus that calculation for 2000).

The absolute size of the under-5 age group increased from 1990 to 2000
by almost exactly 5% (4.99%). The country's overall population
increased by 13.15% in that same ten year period. Clearly, the U.S.
population is skewing older.

This information was provided by the U.S. Census Bureau at
http://www.census.gov/

Thanks for your question. If you need clarification of any of these
numbers, just post your request and I'll get right back to you.

ericynot-ga

Thanks very much, you saved me an incredible amount of time.