-32.22% is the change from 90 to 61
Calculation steps:
[( 61 - 90 ) ÷ 90] x 100 = -32.22%
Formula
Percentage change = [(61 - 90) / 90] x 100
Subtract the new number by the original number
61 - 90 = -29
-29 ÷ 90 = -0.32222222222222224
-0.32222222222222224 x 100 = -32.22%