Am I sedentary or lightly active?

I work at a public library part time, 20 hours per week. My job consists of about an even mix of activity (putting away checked-in books, moving bins of books to be delivered to other libraries), and sedentary activity (running items through the computer, sending emails, typical desk work).

Outside of work I'm not really that active outside of specific exercise that I log here. I'm leaning toward picking sendentary, but it's a tossup. Any thoughts?