-34.74% is the change from 950 to 620
Calculation steps:
[( 620 - 950 ) ÷ 950] x 100 = -34.74%
Formula
Percentage change = [(620 - 950) / 950] x 100
Subtract the new number by the original number
620 - 950 = -330
-330 ÷ 950 = -0.3473684210526316
-0.3473684210526316 x 100 = -34.74%