Tracing Nested Loops on a 2D Array

Consider the following code segment.

int[][] mat = {
    {1, 2, 3},
    {4, 5, 6},
    {7, 8, 9},
    {10, 11, 12}
};

for (int col = 0; col < mat[0].length; col++)
    for (int row = mat.length - 1; row >= col; row--)
        System.out.println(mat[row][col]);

What is the fifth value printed when this code segment is executed?