The last batch of Clinton’s private emails are publicly released. Out of the 30,490 emails, 22 are deemed “top secret,” which is the highest level of classification. 65 are deemed “secret,” the middle level. 2,028 are “confidential,” the lowest level. That means that 2,115 emails, or seven percent of the total, have some classified ranking. 104 of the classified emails were sent by Clinton herself.
It has been reported that Clinton gave the State Department 30,490 emails, and 30,068 of these were ultimately released. Of the remaining 422 emails, 19 are emails between Clinton and President Obama that have not been released, and one more email withheld because it is part of a continuing investigation. It is not known why the remaining 402 have not been released. (The New York Times, 2/29/2016)
However, it has been reported that some emails were returned to Clinton after a determination they were not work-related, so that could explain the discrepancy. (Politico, 9/4/2015)