-2.05% is the change from 684 to 670
Calculation steps:
[( 670 - 684 ) ÷ 684] x 100 = -2.05%
Formula
Percentage change = [(670 - 684) / 684] x 100
Subtract the new number by the original number
670 - 684 = -14
-14 ÷ 684 = -0.02046783625730994
-0.02046783625730994 x 100 = -2.05%