-15.24% is the change from 643 to 545
Calculation steps:
[( 545 - 643 ) ÷ 643] x 100 = -15.24%
Formula
Percentage change = [(545 - 643) / 643] x 100
Subtract the new number by the original number
545 - 643 = -98
-98 ÷ 643 = -0.15241057542768274
-0.15241057542768274 x 100 = -15.24%