-73.95% is the change from 311 to 81
Calculation steps:
[( 81 - 311 ) ÷ 311] x 100 = -73.95%
Formula
Percentage change = [(81 - 311) / 311] x 100
Subtract the new number by the original number
81 - 311 = -230
-230 ÷ 311 = -0.7395498392282959
-0.7395498392282959 x 100 = -73.95%