-22.69% is the change from 670 to 518
Calculation steps:
[( 518 - 670 ) ÷ 670] x 100 = -22.69%
Formula
Percentage change = [(518 - 670) / 670] x 100
Subtract the new number by the original number
518 - 670 = -152
-152 ÷ 670 = -0.22686567164179106
-0.22686567164179106 x 100 = -22.69%