-33.2% is the change from 970 to 648
Calculation steps:
[( 648 - 970 ) ÷ 970] x 100 = -33.2%
Formula
Percentage change = [(648 - 970) / 970] x 100
Subtract the new number by the original number
648 - 970 = -322
-322 ÷ 970 = -0.3319587628865979
-0.3319587628865979 x 100 = -33.2%