-78.79% is the change from 811 to 172
Calculation steps:
[( 172 - 811 ) ÷ 811] x 100 = -78.79%
Formula
Percentage change = [(172 - 811) / 811] x 100
Subtract the new number by the original number
172 - 811 = -639
-639 ÷ 811 = -0.7879161528976573
-0.7879161528976573 x 100 = -78.79%
Example