-67.81% is the change from 668 to 215
Calculation steps:
[( 215 - 668 ) ÷ 668] x 100 = -67.81%
Formula
Percentage change = [(215 - 668) / 668] x 100
Subtract the new number by the original number
215 - 668 = -453
-453 ÷ 668 = -0.6781437125748503
-0.6781437125748503 x 100 = -67.81%