-87.54% is the change from 650 to 81
Calculation steps:
[( 81 - 650 ) ÷ 650] x 100 = -87.54%
Formula
Percentage change = [(81 - 650) / 650] x 100
Subtract the new number by the original number
81 - 650 = -569
-569 ÷ 650 = -0.8753846153846154
-0.8753846153846154 x 100 = -87.54%