-17.69% is the change from 814 to 670
Calculation steps:
[( 670 - 814 ) ÷ 814] x 100 = -17.69%
Formula
Percentage change = [(670 - 814) / 814] x 100
Subtract the new number by the original number
670 - 814 = -144
-144 ÷ 814 = -0.1769041769041769
-0.1769041769041769 x 100 = -17.69%