-81.99% is the change from 311 to 56
Calculation steps:
[( 56 - 311 ) ÷ 311] x 100 = -81.99%
Formula
Percentage change = [(56 - 311) / 311] x 100
Subtract the new number by the original number
56 - 311 = -255
-255 ÷ 311 = -0.819935691318328
-0.819935691318328 x 100 = -81.99%