-50.3% is the change from 165 to 82
Calculation steps:
[( 82 - 165 ) ÷ 165] x 100 = -50.3%
Formula
Percentage change = [(82 - 165) / 165] x 100
Subtract the new number by the original number
82 - 165 = -83
-83 ÷ 165 = -0.503030303030303
-0.503030303030303 x 100 = -50.3%