# Question about Mean Income for Students by Income Tercile

I have four questions although the one referenced in the title is the one I'm most interested in:

1) Looking at variables, COUNT_WNE_INC1_P10, COUNT_WNE_INC2_P10, and COUNT_WNE_INC1_P10... I always interpreted them as: the number of students whose earnings fall in the first tercile, second tercile, and third tercile. However, this doesn't appear to be the case because the values of the corresponding means (MN_EARN_WNE_INC1_P10, MN_EARN_WNE_INC2_P10, MN_EARN_WNE_INC3_P10) should be mathematically impossible based on my interpretation.

Do these variables then mean students who come from families which lie in that income tercile?

2) Why doesn't COUNT_WNE_P10 equal the sum of COUNT_WNE_INC1_P10, COUNT_WNE_INC2_P10, and COUNT_WNE_INC1_P10?

3) I'm using the sum of COUNT_WNE_P10 and COUNT_NWNE_P10 as a rough estimate as the size of the cohort. However, I notice that this total is increasing year after year. Why is that?

4) Why has there been no earnings data reported since 2014?