50.84% is the change from 657 to 991
Calculation steps:
[( 991 - 657 ) ÷ 657] x 100 = 50.84%
Formula
Percentage change = [(991 - 657) / 657] x 100
Subtract the new number by the original number
991 - 657 = 334
334 ÷ 657 = 0.5083713850837138
0.5083713850837138 x 100 = 50.84%