-21.05% is the change from 684 to 540
Calculation steps:
[( 540 - 684 ) ÷ 684] x 100 = -21.05%
Formula
Percentage change = [(540 - 684) / 684] x 100
Subtract the new number by the original number
540 - 684 = -144
-144 ÷ 684 = -0.21052631578947367
-0.21052631578947367 x 100 = -21.05%