-64.33% is the change from 171 to 61
Calculation steps:
[( 61 - 171 ) ÷ 171] x 100 = -64.33%
Formula
Percentage change = [(61 - 171) / 171] x 100
Subtract the new number by the original number
61 - 171 = -110
-110 ÷ 171 = -0.6432748538011696
-0.6432748538011696 x 100 = -64.33%