-67.16% is the change from 670 to 220
Calculation steps:
[( 220 - 670 ) ÷ 670] x 100 = -67.16%
Formula
Percentage change = [(220 - 670) / 670] x 100
Subtract the new number by the original number
220 - 670 = -450
-450 ÷ 670 = -0.6716417910447762
-0.6716417910447762 x 100 = -67.16%