99.68% is the change from 311 to 621
Calculation steps:
[( 621 - 311 ) ÷ 311] x 100 = 99.68%
Formula
Percentage change = [(621 - 311) / 311] x 100
Subtract the new number by the original number
621 - 311 = 310
310 ÷ 311 = 0.9967845659163987
0.9967845659163987 x 100 = 99.68%