-34.38% is the change from 960 to 630
Calculation steps:
[( 630 - 960 ) ÷ 960] x 100 = -34.38%
Formula
Percentage change = [(630 - 960) / 960] x 100
Subtract the new number by the original number
630 - 960 = -330
-330 ÷ 960 = -0.34375
-0.34375 x 100 = -34.38%