167.9% is the change from 81 to 217
Calculation steps:
[( 217 - 81 ) ÷ 81] x 100 = 167.9%
Formula
Percentage change = [(217 - 81) / 81] x 100
Subtract the new number by the original number
217 - 81 = 136
136 ÷ 81 = 1.6790123456790123
1.6790123456790123 x 100 = 167.9%