Obtaining Total Household counts for 1990 and 2000

Hi,

I added up all households in Census 1990 and 2000 using hhwt and pernum=1 to cross-check the totals, and I find that for 1990 my household count is 91,746,420.00 and for 2000 it is 113,264,611
. However, I found the following published numbers, 91,993,582 and 105,480,101, for each year respectively, in page 13/48 of the following report https://www.census.gov/prod/2005pubs/censr-24.pdf . Could you please help understand how to obtain the right household count for each Census and ACS files? Thank you,

Marta