A simple random sample of 14 students on a large university campus is asked to complete a survey. One of the questions on the survey asks for the number of credit hours for which they are currently enrolled. The results of the survey are shown below.

12, 9, 13, 15, 12, 16, 19, 13, 12, 12, 16, 12, 14, 6

What is the median number of credit hours for this sample?