-51.34% is the change from 670 to 326
Calculation steps:
[( 326 - 670 ) ÷ 670] x 100 = -51.34%
Formula
Percentage change = [(326 - 670) / 670] x 100
Subtract the new number by the original number
326 - 670 = -344
-344 ÷ 670 = -0.5134328358208955
-0.5134328358208955 x 100 = -51.34%