Accounting for unequal sample sizes - Crosstabs

#1
Hello, I am trying to account for unequal sample sizes in two different time periods, but not sure how to go about doing that. I'm trying to crosstab Zip code of residence and enrollment in food stamps, using the same population in both time periods. However, we were not able to get a hold of everyone the second time around, so we got very few data on time period two.

Thanks!