21.49% is the change from 670 to 814
Calculation steps:
[( 814 - 670 ) ÷ 670] x 100 = 21.49%
Formula
Percentage change = [(814 - 670) / 670] x 100
Subtract the new number by the original number
814 - 670 = 144
144 ÷ 670 = 0.21492537313432836
0.21492537313432836 x 100 = 21.49%