-20.6% is the change from 670 to 532
Calculation steps:
[( 532 - 670 ) ÷ 670] x 100 = -20.6%
Formula
Percentage change = [(532 - 670) / 670] x 100
Subtract the new number by the original number
532 - 670 = -138
-138 ÷ 670 = -0.20597014925373133
-0.20597014925373133 x 100 = -20.6%