-29.68% is the change from 866 to 609
Calculation steps:
[( 609 - 866 ) ÷ 866] x 100 = -29.68%
Formula
Percentage change = [(609 - 866) / 866] x 100
Subtract the new number by the original number
609 - 866 = -257
-257 ÷ 866 = -0.2967667436489607
-0.2967667436489607 x 100 = -29.68%