-15.94% is the change from 646 to 543
Calculation steps:
[( 543 - 646 ) ÷ 646] x 100 = -15.94%
Formula
Percentage change = [(543 - 646) / 646] x 100
Subtract the new number by the original number
543 - 646 = -103
-103 ÷ 646 = -0.15944272445820434
-0.15944272445820434 x 100 = -15.94%