-37.16% is the change from 670 to 421
Calculation steps:
[( 421 - 670 ) ÷ 670] x 100 = -37.16%
Formula
Percentage change = [(421 - 670) / 670] x 100
Subtract the new number by the original number
421 - 670 = -249
-249 ÷ 670 = -0.3716417910447761
-0.3716417910447761 x 100 = -37.16%