-87.63% is the change from 663 to 82
Calculation steps:
[( 82 - 663 ) ÷ 663] x 100 = -87.63%
Formula
Percentage change = [(82 - 663) / 663] x 100
Subtract the new number by the original number
82 - 663 = -581
-581 ÷ 663 = -0.8763197586726998
-0.8763197586726998 x 100 = -87.63%