-73.62% is the change from 307 to 81
Calculation steps:
[( 81 - 307 ) ÷ 307] x 100 = -73.62%
Formula
Percentage change = [(81 - 307) / 307] x 100
Subtract the new number by the original number
81 - 307 = -226
-226 ÷ 307 = -0.7361563517915309
-0.7361563517915309 x 100 = -73.62%