-37.8% is the change from 82 to 51
Calculation steps:
[( 51 - 82 ) ÷ 82] x 100 = -37.8%
Formula
Percentage change = [(51 - 82) / 82] x 100
Subtract the new number by the original number
51 - 82 = -31
-31 ÷ 82 = -0.3780487804878049
-0.3780487804878049 x 100 = -37.8%