64.2% is the change from 81 to 133
Calculation steps:
[( 133 - 81 ) ÷ 81] x 100 = 64.2%
Formula
Percentage change = [(133 - 81) / 81] x 100
Subtract the new number by the original number
133 - 81 = 52
52 ÷ 81 = 0.6419753086419753
0.6419753086419753 x 100 = 64.2%