-76.32% is the change from 870 to 206
Calculation steps:
[( 206 - 870 ) ÷ 870] x 100 = -76.32%
Formula
Percentage change = [(206 - 870) / 870] x 100
Subtract the new number by the original number
206 - 870 = -664
-664 ÷ 870 = -0.7632183908045977
-0.7632183908045977 x 100 = -76.32%