99.04% is the change from 312 to 621
Calculation steps:
[( 621 - 312 ) ÷ 312] x 100 = 99.04%
Formula
Percentage change = [(621 - 312) / 312] x 100
Subtract the new number by the original number
621 - 312 = 309
309 ÷ 312 = 0.9903846153846154
0.9903846153846154 x 100 = 99.04%