-66.4% is the change from 866 to 291
Calculation steps:
[( 291 - 866 ) ÷ 866] x 100 = -66.4%
Formula
Percentage change = [(291 - 866) / 866] x 100
Subtract the new number by the original number
291 - 866 = -575
-575 ÷ 866 = -0.663972286374134
-0.663972286374134 x 100 = -66.4%