-59.5% is the change from 200 to 81
Calculation steps:
[( 81 - 200 ) ÷ 200] x 100 = -59.5%
Formula
Percentage change = [(81 - 200) / 200] x 100
Subtract the new number by the original number
81 - 200 = -119
-119 ÷ 200 = -0.595
-0.595 x 100 = -59.5%
Example