-1.88% is the change from 850 to 834
Calculation steps:
[( 834 - 850 ) ÷ 850] x 100 = -1.88%
Formula
Percentage change = [(834 - 850) / 850] x 100
Subtract the new number by the original number
834 - 850 = -16
-16 ÷ 850 = -0.018823529411764704
-0.018823529411764704 x 100 = -1.88%