-18.87% is the change from 816 to 662
Calculation steps:
[( 662 - 816 ) ÷ 816] x 100 = -18.87%
Formula
Percentage change = [(662 - 816) / 816] x 100
Subtract the new number by the original number
662 - 816 = -154
-154 ÷ 816 = -0.18872549019607843
-0.18872549019607843 x 100 = -18.87%