-7.27% is the change from 660 to 612
Calculation steps:
[( 612 - 660 ) ÷ 660] x 100 = -7.27%
Formula
Percentage change = [(612 - 660) / 660] x 100
Subtract the new number by the original number
612 - 660 = -48
-48 ÷ 660 = -0.07272727272727272
-0.07272727272727272 x 100 = -7.27%