-22.2% is the change from 644 to 501
Calculation steps:
[( 501 - 644 ) ÷ 644] x 100 = -22.2%
Formula
Percentage change = [(501 - 644) / 644] x 100
Subtract the new number by the original number
501 - 644 = -143
-143 ÷ 644 = -0.2220496894409938
-0.2220496894409938 x 100 = -22.2%