-2.01% is the change from 646 to 633
Calculation steps:
[( 633 - 646 ) ÷ 646] x 100 = -2.01%
Formula
Percentage change = [(633 - 646) / 646] x 100
Subtract the new number by the original number
633 - 646 = -13
-13 ÷ 646 = -0.020123839009287926
-0.020123839009287926 x 100 = -2.01%