-3.7% is the change from 866 to 834
Calculation steps:
[( 834 - 866 ) ÷ 866] x 100 = -3.7%
Formula
Percentage change = [(834 - 866) / 866] x 100
Subtract the new number by the original number
834 - 866 = -32
-32 ÷ 866 = -0.03695150115473441
-0.03695150115473441 x 100 = -3.7%