-80.09% is the change from 859 to 171
Calculation steps:
[( 171 - 859 ) ÷ 859] x 100 = -80.09%
Formula
Percentage change = [(171 - 859) / 859] x 100
Subtract the new number by the original number
171 - 859 = -688
-688 ÷ 859 = -0.8009313154831199
-0.8009313154831199 x 100 = -80.09%