-7.01% is the change from 670 to 623
Calculation steps:
[( 623 - 670 ) ÷ 670] x 100 = -7.01%
Formula
Percentage change = [(623 - 670) / 670] x 100
Subtract the new number by the original number
623 - 670 = -47
-47 ÷ 670 = -0.07014925373134329
-0.07014925373134329 x 100 = -7.01%