-68.26% is the change from 668 to 212
Calculation steps:
[( 212 - 668 ) ÷ 668] x 100 = -68.26%
Formula
Percentage change = [(212 - 668) / 668] x 100
Subtract the new number by the original number
212 - 668 = -456
-456 ÷ 668 = -0.6826347305389222
-0.6826347305389222 x 100 = -68.26%