-76.47% is the change from 51 to 12
Calculation steps:
[( 12 - 51 ) ÷ 51] x 100 = -76.47%
Formula
Percentage change = [(12 - 51) / 51] x 100
Subtract the new number by the original number
12 - 51 = -39
-39 ÷ 51 = -0.7647058823529411
-0.7647058823529411 x 100 = -76.47%