Statistical Testing Tool - does this work for percents?


I'm interested in using this Statistical Testing Tool ( to compare '10-'14 to '15-'19, but for percentages rather than for estimates.  The examples all show estimates only.  If both the numerators and the denominators are statistically different, does that mean the percentage would be?  (My intuition would be no, since population in general has grown over that period, so the raw numbers for both would be higher.)