-6.14% is the change from 684 to 642
Calculation steps:
[( 642 - 684 ) ÷ 684] x 100 = -6.14%
Formula
Percentage change = [(642 - 684) / 684] x 100
Subtract the new number by the original number
642 - 684 = -42
-42 ÷ 684 = -0.06140350877192982
-0.06140350877192982 x 100 = -6.14%