For my City (Soldotna, AK), the percentage of women who had a birth in the past 12 months is listed as 8.6%. However, if you 'Switch to totals,' you see it's only 81 births (out of about 4,300 -- so it's actually about 1.9%). It looks like - to arrive at the total percentage of births - you just added up all the percentages from the different age categories. But this wouldn't be correct.

Please double-check. Almost 1/10 women giving birth every year would be an amazingly large number.