-30.95% is the change from 937 to 647
Calculation steps:
[( 647 - 937 ) ÷ 937] x 100 = -30.95%
Formula
Percentage change = [(647 - 937) / 937] x 100
Subtract the new number by the original number
647 - 937 = -290
-290 ÷ 937 = -0.3094983991462113
-0.3094983991462113 x 100 = -30.95%