-37.15% is the change from 646 to 406
Calculation steps:
[( 406 - 646 ) ÷ 646] x 100 = -37.15%
Formula
Percentage change = [(406 - 646) / 646] x 100
Subtract the new number by the original number
406 - 646 = -240
-240 ÷ 646 = -0.3715170278637771
-0.3715170278637771 x 100 = -37.15%