-53.43% is the change from 670 to 312
Calculation steps:
[( 312 - 670 ) ÷ 670] x 100 = -53.43%
Formula
Percentage change = [(312 - 670) / 670] x 100
Subtract the new number by the original number
312 - 670 = -358
-358 ÷ 670 = -0.5343283582089552
-0.5343283582089552 x 100 = -53.43%