-82.7% is the change from 497 to 86
Calculation steps:
[( 86 - 497 ) ÷ 497] x 100 = -82.7%
Formula
Percentage change = [(86 - 497) / 497] x 100
Subtract the new number by the original number
86 - 497 = -411
-411 ÷ 497 = -0.8269617706237424
-0.8269617706237424 x 100 = -82.7%