20.88% is the change from 637 to 770
Calculation steps:
[( 770 - 637 ) ÷ 637] x 100 = 20.88%
Formula
Percentage change = [(770 - 637) / 637] x 100
Subtract the new number by the original number
770 - 637 = 133
133 ÷ 637 = 0.2087912087912088
0.2087912087912088 x 100 = 20.88%