-19.88% is the change from 825 to 661
Calculation steps:
[( 661 - 825 ) ÷ 825] x 100 = -19.88%
Formula
Percentage change = [(661 - 825) / 825] x 100
Subtract the new number by the original number
661 - 825 = -164
-164 ÷ 825 = -0.1987878787878788
-0.1987878787878788 x 100 = -19.88%