-4% is the change from 851 to 817
Calculation steps:
[( 817 - 851 ) ÷ 851] x 100 = -4%
Formula
Percentage change = [(817 - 851) / 851] x 100
Subtract the new number by the original number
817 - 851 = -34
-34 ÷ 851 = -0.0399529964747356
-0.0399529964747356 x 100 = -4%