-66.87% is the change from 646 to 214
Calculation steps:
[( 214 - 646 ) ÷ 646] x 100 = -66.87%
Formula
Percentage change = [(214 - 646) / 646] x 100
Subtract the new number by the original number
214 - 646 = -432
-432 ÷ 646 = -0.6687306501547987
-0.6687306501547987 x 100 = -66.87%