-16.49% is the change from 643 to 537
Calculation steps:
[( 537 - 643 ) ÷ 643] x 100 = -16.49%
Formula
Percentage change = [(537 - 643) / 643] x 100
Subtract the new number by the original number
537 - 643 = -106
-106 ÷ 643 = -0.16485225505443235
-0.16485225505443235 x 100 = -16.49%