-16.02% is the change from 643 to 540
Calculation steps:
[( 540 - 643 ) ÷ 643] x 100 = -16.02%
Formula
Percentage change = [(540 - 643) / 643] x 100
Subtract the new number by the original number
540 - 643 = -103
-103 ÷ 643 = -0.16018662519440124
-0.16018662519440124 x 100 = -16.02%