-68.61% is the change from 685 to 215
Calculation steps:
[( 215 - 685 ) ÷ 685] x 100 = -68.61%
Formula
Percentage change = [(215 - 685) / 685] x 100
Subtract the new number by the original number
215 - 685 = -470
-470 ÷ 685 = -0.6861313868613139
-0.6861313868613139 x 100 = -68.61%