-1.8% is the change from 834 to 819
Calculation steps:
[( 819 - 834 ) ÷ 834] x 100 = -1.8%
Formula
Percentage change = [(819 - 834) / 834] x 100
Subtract the new number by the original number
819 - 834 = -15
-15 ÷ 834 = -0.017985611510791366
-0.017985611510791366 x 100 = -1.8%