-15.63% is the change from 646 to 545
Calculation steps:
[( 545 - 646 ) ÷ 646] x 100 = -15.63%
Formula
Percentage change = [(545 - 646) / 646] x 100
Subtract the new number by the original number
545 - 646 = -101
-101 ÷ 646 = -0.1563467492260062
-0.1563467492260062 x 100 = -15.63%