-36.08% is the change from 970 to 620
Calculation steps:
[( 620 - 970 ) ÷ 970] x 100 = -36.08%
Formula
Percentage change = [(620 - 970) / 970] x 100
Subtract the new number by the original number
620 - 970 = -350
-350 ÷ 970 = -0.36082474226804123
-0.36082474226804123 x 100 = -36.08%