-33.71% is the change from 970 to 643
Calculation steps:
[( 643 - 970 ) ÷ 970] x 100 = -33.71%
Formula
Percentage change = [(643 - 970) / 970] x 100
Subtract the new number by the original number
643 - 970 = -327
-327 ÷ 970 = -0.3371134020618557
-0.3371134020618557 x 100 = -33.71%