-16.95% is the change from 643 to 534
Calculation steps:
[( 534 - 643 ) ÷ 643] x 100 = -16.95%
Formula
Percentage change = [(534 - 643) / 643] x 100
Subtract the new number by the original number
534 - 643 = -109
-109 ÷ 643 = -0.16951788491446346
-0.16951788491446346 x 100 = -16.95%