-25.22% is the change from 670 to 501
Calculation steps:
[( 501 - 670 ) ÷ 670] x 100 = -25.22%
Formula
Percentage change = [(501 - 670) / 670] x 100
Subtract the new number by the original number
501 - 670 = -169
-169 ÷ 670 = -0.25223880597014925
-0.25223880597014925 x 100 = -25.22%