-83.98% is the change from 643 to 103
Calculation steps:
[( 103 - 643 ) ÷ 643] x 100 = -83.98%
Formula
Percentage change = [(103 - 643) / 643] x 100
Subtract the new number by the original number
103 - 643 = -540
-540 ÷ 643 = -0.8398133748055988
-0.8398133748055988 x 100 = -83.98%