2.5% is the change from 641 to 657
Calculation steps:
[( 657 - 641 ) ÷ 641] x 100 = 2.5%
Formula
Percentage change = [(657 - 641) / 641] x 100
Subtract the new number by the original number
657 - 641 = 16
16 ÷ 641 = 0.0249609984399376
0.0249609984399376 x 100 = 2.5%