-74.94% is the change from 866 to 217
Calculation steps:
[( 217 - 866 ) ÷ 866] x 100 = -74.94%
Formula
Percentage change = [(217 - 866) / 866] x 100
Subtract the new number by the original number
217 - 866 = -649
-649 ÷ 866 = -0.7494226327944573
-0.7494226327944573 x 100 = -74.94%