21.34% is the change from 670 to 813
Calculation steps:
[( 813 - 670 ) ÷ 670] x 100 = 21.34%
Formula
Percentage change = [(813 - 670) / 670] x 100
Subtract the new number by the original number
813 - 670 = 143
143 ÷ 670 = 0.21343283582089553
0.21343283582089553 x 100 = 21.34%