-22.45% is the change from 646 to 501
Calculation steps:
[( 501 - 646 ) ÷ 646] x 100 = -22.45%
Formula
Percentage change = [(501 - 646) / 646] x 100
Subtract the new number by the original number
501 - 646 = -145
-145 ÷ 646 = -0.22445820433436534
-0.22445820433436534 x 100 = -22.45%