1.23% is the change from 81 to 82
Calculation steps:
[( 82 - 81 ) ÷ 81] x 100 = 1.23%
Formula
Percentage change = [(82 - 81) / 81] x 100
Subtract the new number by the original number
82 - 81 = 1
1 ÷ 81 = 0.012345679012345678
0.012345679012345678 x 100 = 1.23%