-23.21% is the change from 866 to 665
Calculation steps:
[( 665 - 866 ) ÷ 866] x 100 = -23.21%
Formula
Percentage change = [(665 - 866) / 866] x 100
Subtract the new number by the original number
665 - 866 = -201
-201 ÷ 866 = -0.23210161662817552
-0.23210161662817552 x 100 = -23.21%