-68.46% is the change from 688 to 217
Calculation steps:
[( 217 - 688 ) ÷ 688] x 100 = -68.46%
Formula
Percentage change = [(217 - 688) / 688] x 100
Subtract the new number by the original number
217 - 688 = -471
-471 ÷ 688 = -0.684593023255814
-0.684593023255814 x 100 = -68.46%