-78.92% is the change from 816 to 172
Calculation steps:
[( 172 - 816 ) ÷ 816] x 100 = -78.92%
Formula
Percentage change = [(172 - 816) / 816] x 100
Subtract the new number by the original number
172 - 816 = -644
-644 ÷ 816 = -0.7892156862745098
-0.7892156862745098 x 100 = -78.92%