-74.48% is the change from 866 to 221
Calculation steps:
[( 221 - 866 ) ÷ 866] x 100 = -74.48%
Formula
Percentage change = [(221 - 866) / 866] x 100
Subtract the new number by the original number
221 - 866 = -645
-645 ÷ 866 = -0.7448036951501155
-0.7448036951501155 x 100 = -74.48%