-84.33% is the change from 517 to 81
Calculation steps:
[( 81 - 517 ) ÷ 517] x 100 = -84.33%
Formula
Percentage change = [(81 - 517) / 517] x 100
Subtract the new number by the original number
81 - 517 = -436
-436 ÷ 517 = -0.8433268858800773
-0.8433268858800773 x 100 = -84.33%