-66.84% is the change from 950 to 315
Calculation steps:
[( 315 - 950 ) ÷ 950] x 100 = -66.84%
Formula
Percentage change = [(315 - 950) / 950] x 100
Subtract the new number by the original number
315 - 950 = -635
-635 ÷ 950 = -0.6684210526315789
-0.6684210526315789 x 100 = -66.84%