-20.76% is the change from 660 to 523
Calculation steps:
[( 523 - 660 ) ÷ 660] x 100 = -20.76%
Formula
Percentage change = [(523 - 660) / 660] x 100
Subtract the new number by the original number
523 - 660 = -137
-137 ÷ 660 = -0.20757575757575758
-0.20757575757575758 x 100 = -20.76%