-78.73% is the change from 851 to 181
Calculation steps:
[( 181 - 851 ) ÷ 851] x 100 = -78.73%
Formula
Percentage change = [(181 - 851) / 851] x 100
Subtract the new number by the original number
181 - 851 = -670
-670 ÷ 851 = -0.7873090481786134
-0.7873090481786134 x 100 = -78.73%