-17.73% is the change from 660 to 543
Calculation steps:
[( 543 - 660 ) ÷ 660] x 100 = -17.73%
Formula
Percentage change = [(543 - 660) / 660] x 100
Subtract the new number by the original number
543 - 660 = -117
-117 ÷ 660 = -0.17727272727272728
-0.17727272727272728 x 100 = -17.73%