-52.39% is the change from 670 to 319
Calculation steps:
[( 319 - 670 ) ÷ 670] x 100 = -52.39%
Formula
Percentage change = [(319 - 670) / 670] x 100
Subtract the new number by the original number
319 - 670 = -351
-351 ÷ 670 = -0.5238805970149254
-0.5238805970149254 x 100 = -52.39%