-62.57% is the change from 171 to 64
Calculation steps:
[( 64 - 171 ) ÷ 171] x 100 = -62.57%
Formula
Percentage change = [(64 - 171) / 171] x 100
Subtract the new number by the original number
64 - 171 = -107
-107 ÷ 171 = -0.6257309941520468
-0.6257309941520468 x 100 = -62.57%