-11.79% is the change from 670 to 591
Calculation steps:
[( 591 - 670 ) ÷ 670] x 100 = -11.79%
Formula
Percentage change = [(591 - 670) / 670] x 100
Subtract the new number by the original number
591 - 670 = -79
-79 ÷ 670 = -0.11791044776119403
-0.11791044776119403 x 100 = -11.79%