1.9% is the change from 315 to 321
Calculation steps:
[( 321 - 315 ) ÷ 315] x 100 = 1.9%
Formula
Percentage change = [(321 - 315) / 315] x 100
Subtract the new number by the original number
321 - 315 = 6
6 ÷ 315 = 0.01904761904761905
0.01904761904761905 x 100 = 1.9%