-1.85% is the change from 866 to 850
Calculation steps:
[( 850 - 866 ) ÷ 866] x 100 = -1.85%
Formula
Percentage change = [(850 - 866) / 866] x 100
Subtract the new number by the original number
850 - 866 = -16
-16 ÷ 866 = -0.018475750577367205
-0.018475750577367205 x 100 = -1.85%