34.06% is the change from 646 to 866
Calculation steps:
[( 866 - 646 ) ÷ 646] x 100 = 34.06%
Formula
Percentage change = [(866 - 646) / 646] x 100
Subtract the new number by the original number
866 - 646 = 220
220 ÷ 646 = 0.34055727554179566
0.34055727554179566 x 100 = 34.06%