-21.94% is the change from 670 to 523
Calculation steps:
[( 523 - 670 ) ÷ 670] x 100 = -21.94%
Formula
Percentage change = [(523 - 670) / 670] x 100
Subtract the new number by the original number
523 - 670 = -147
-147 ÷ 670 = -0.21940298507462686
-0.21940298507462686 x 100 = -21.94%