-52.54% is the change from 670 to 318
Calculation steps:
[( 318 - 670 ) ÷ 670] x 100 = -52.54%
Formula
Percentage change = [(318 - 670) / 670] x 100
Subtract the new number by the original number
318 - 670 = -352
-352 ÷ 670 = -0.5253731343283582
-0.5253731343283582 x 100 = -52.54%