-90.7% is the change from 129 to 12
Calculation steps:
[( 12 - 129 ) ÷ 129] x 100 = -90.7%
Formula
Percentage change = [(12 - 129) / 129] x 100
Subtract the new number by the original number
12 - 129 = -117
-117 ÷ 129 = -0.9069767441860465
-0.9069767441860465 x 100 = -90.7%