-4.93% is the change from 670 to 637
Calculation steps:
[( 637 - 670 ) ÷ 670] x 100 = -4.93%
Formula
Percentage change = [(637 - 670) / 670] x 100
Subtract the new number by the original number
637 - 670 = -33
-33 ÷ 670 = -0.049253731343283584
-0.049253731343283584 x 100 = -4.93%