-3.36% is the change from 684 to 661
Calculation steps:
[( 661 - 684 ) ÷ 684] x 100 = -3.36%
Formula
Percentage change = [(661 - 684) / 684] x 100
Subtract the new number by the original number
661 - 684 = -23
-23 ÷ 684 = -0.033625730994152045
-0.033625730994152045 x 100 = -3.36%