21.1% is the change from 815 to 987
Calculation steps:
[( 987 - 815 ) ÷ 815] x 100 = 21.1%
Formula
Percentage change = [(987 - 815) / 815] x 100
Subtract the new number by the original number
987 - 815 = 172
172 ÷ 815 = 0.21104294478527608
0.21104294478527608 x 100 = 21.1%