-18.6% is the change from 812 to 661
Calculation steps:
[( 661 - 812 ) ÷ 812] x 100 = -18.6%
Formula
Percentage change = [(661 - 812) / 812] x 100
Subtract the new number by the original number
661 - 812 = -151
-151 ÷ 812 = -0.18596059113300492
-0.18596059113300492 x 100 = -18.6%