31.1% is the change from 688 to 902
Calculation steps:
[( 902 - 688 ) ÷ 688] x 100 = 31.1%
Formula
Percentage change = [(902 - 688) / 688] x 100
Subtract the new number by the original number
902 - 688 = 214
214 ÷ 688 = 0.311046511627907
0.311046511627907 x 100 = 31.1%