-65.57% is the change from 61 to 21
Calculation steps:
[( 21 - 61 ) ÷ 61] x 100 = -65.57%
Formula
Percentage change = [(21 - 61) / 61] x 100
Subtract the new number by the original number
21 - 61 = -40
-40 ÷ 61 = -0.6557377049180327
-0.6557377049180327 x 100 = -65.57%