-1.2% is the change from 83 to 82
Calculation steps:
[( 82 - 83 ) ÷ 83] x 100 = -1.2%
Formula
Percentage change = [(82 - 83) / 83] x 100
Subtract the new number by the original number
82 - 83 = -1
-1 ÷ 83 = -0.012048192771084338
-0.012048192771084338 x 100 = -1.2%