-21.82% is the change from 660 to 516
Calculation steps:
[( 516 - 660 ) ÷ 660] x 100 = -21.82%
Formula
Percentage change = [(516 - 660) / 660] x 100
Subtract the new number by the original number
516 - 660 = -144
-144 ÷ 660 = -0.21818181818181817
-0.21818181818181817 x 100 = -21.82%