-23.67% is the change from 866 to 661
Calculation steps:
[( 661 - 866 ) ÷ 866] x 100 = -23.67%
Formula
Percentage change = [(661 - 866) / 866] x 100
Subtract the new number by the original number
661 - 866 = -205
-205 ÷ 866 = -0.23672055427251731
-0.23672055427251731 x 100 = -23.67%