-81.09% is the change from 899 to 170
Calculation steps:
[( 170 - 899 ) ÷ 899] x 100 = -81.09%
Formula
Percentage change = [(170 - 899) / 899] x 100
Subtract the new number by the original number
170 - 899 = -729
-729 ÷ 899 = -0.8109010011123471
-0.8109010011123471 x 100 = -81.09%