21.04% is the change from 670 to 811
Calculation steps:
[( 811 - 670 ) ÷ 670] x 100 = 21.04%
Formula
Percentage change = [(811 - 670) / 670] x 100
Subtract the new number by the original number
811 - 670 = 141
141 ÷ 670 = 0.21044776119402986
0.21044776119402986 x 100 = 21.04%