-68.66% is the change from 686 to 215
Calculation steps:
[( 215 - 686 ) ÷ 686] x 100 = -68.66%
Formula
Percentage change = [(215 - 686) / 686] x 100
Subtract the new number by the original number
215 - 686 = -471
-471 ÷ 686 = -0.6865889212827988
-0.6865889212827988 x 100 = -68.66%