-24.21% is the change from 661 to 501
Calculation steps:
[( 501 - 661 ) ÷ 661] x 100 = -24.21%
Formula
Percentage change = [(501 - 661) / 661] x 100
Subtract the new number by the original number
501 - 661 = -160
-160 ÷ 661 = -0.24205748865355523
-0.24205748865355523 x 100 = -24.21%