-23.18% is the change from 837 to 643
Calculation steps:
[( 643 - 837 ) ÷ 837] x 100 = -23.18%
Formula
Percentage change = [(643 - 837) / 837] x 100
Subtract the new number by the original number
643 - 837 = -194
-194 ÷ 837 = -0.23178016726403824
-0.23178016726403824 x 100 = -23.18%