19.93% is the change from 537 to 644
Calculation steps:
[( 644 - 537 ) ÷ 537] x 100 = 19.93%
Formula
Percentage change = [(644 - 537) / 537] x 100
Subtract the new number by the original number
644 - 537 = 107
107 ÷ 537 = 0.19925512104283055
0.19925512104283055 x 100 = 19.93%