What should I fill in the question mark part? Why? 8 13 12 6 22 3 43 5 5 3 4 2 9 5 11 6

What should I fill in the question mark part? Why? 8 13 12 6 22 3 43 5 5 3 4 2 9 5 11 6

The number in the middle is the sum of the number in the upper left corner and the number in the upper right corner divided by the number in the lower right corner and the number in the lower left corner
(43+5)/6+11=19