33.49% is the change from 645 to 861
Calculation steps:
[( 861 - 645 ) ÷ 645] x 100 = 33.49%
Formula
Percentage change = [(861 - 645) / 645] x 100
Subtract the new number by the original number
861 - 645 = 216
216 ÷ 645 = 0.33488372093023255
0.33488372093023255 x 100 = 33.49%