-35.05% is the change from 970 to 630
Calculation steps:
[( 630 - 970 ) ÷ 970] x 100 = -35.05%
Formula
Percentage change = [(630 - 970) / 970] x 100
Subtract the new number by the original number
630 - 970 = -340
-340 ÷ 970 = -0.35051546391752575
-0.35051546391752575 x 100 = -35.05%