-14.62% is the change from 643 to 549
Calculation steps:
[( 549 - 643 ) ÷ 643] x 100 = -14.62%
Formula
Percentage change = [(549 - 643) / 643] x 100
Subtract the new number by the original number
549 - 643 = -94
-94 ÷ 643 = -0.14618973561430793
-0.14618973561430793 x 100 = -14.62%