34.78% is the change from 621 to 837
Calculation steps:
[( 837 - 621 ) ÷ 621] x 100 = 34.78%
Formula
Percentage change = [(837 - 621) / 621] x 100
Subtract the new number by the original number
837 - 621 = 216
216 ÷ 621 = 0.34782608695652173
0.34782608695652173 x 100 = 34.78%