-23.5% is the change from 868 to 664
Calculation steps:
[( 664 - 868 ) ÷ 868] x 100 = -23.5%
Formula
Percentage change = [(664 - 868) / 868] x 100
Subtract the new number by the original number
664 - 868 = -204
-204 ÷ 868 = -0.2350230414746544
-0.2350230414746544 x 100 = -23.5%