-81.01% is the change from 337 to 64
Calculation steps:
[( 64 - 337 ) ÷ 337] x 100 = -81.01%
Formula
Percentage change = [(64 - 337) / 337] x 100
Subtract the new number by the original number
64 - 337 = -273
-273 ÷ 337 = -0.8100890207715133
-0.8100890207715133 x 100 = -81.01%