51.75% is the change from 657 to 997
Calculation steps:
[( 997 - 657 ) ÷ 657] x 100 = 51.75%
Formula
Percentage change = [(997 - 657) / 657] x 100
Subtract the new number by the original number
997 - 657 = 340
340 ÷ 657 = 0.517503805175038
0.517503805175038 x 100 = 51.75%