33.9% is the change from 643 to 861
Calculation steps:
[( 861 - 643 ) ÷ 643] x 100 = 33.9%
Formula
Percentage change = [(861 - 643) / 643] x 100
Subtract the new number by the original number
861 - 643 = 218
218 ÷ 643 = 0.3390357698289269
0.3390357698289269 x 100 = 33.9%