-2% is the change from 851 to 834
Calculation steps:
[( 834 - 851 ) ÷ 851] x 100 = -2%
Formula
Percentage change = [(834 - 851) / 851] x 100
Subtract the new number by the original number
834 - 851 = -17
-17 ÷ 851 = -0.0199764982373678
-0.0199764982373678 x 100 = -2%