-53.58% is the change from 670 to 311
Calculation steps:
[( 311 - 670 ) ÷ 670] x 100 = -53.58%
Formula
Percentage change = [(311 - 670) / 670] x 100
Subtract the new number by the original number
311 - 670 = -359
-359 ÷ 670 = -0.5358208955223881
-0.5358208955223881 x 100 = -53.58%