-18.09% is the change from 807 to 661
Calculation steps:
[( 661 - 807 ) ÷ 807] x 100 = -18.09%
Formula
Percentage change = [(661 - 807) / 807] x 100
Subtract the new number by the original number
661 - 807 = -146
-146 ÷ 807 = -0.1809169764560099
-0.1809169764560099 x 100 = -18.09%