-6.42% is the change from 670 to 627
Calculation steps:
[( 627 - 670 ) ÷ 670] x 100 = -6.42%
Formula
Percentage change = [(627 - 670) / 670] x 100
Subtract the new number by the original number
627 - 670 = -43
-43 ÷ 670 = -0.06417910447761194
-0.06417910447761194 x 100 = -6.42%