Yes. Shitloads.
http://metrics.torproject.org/graphs.html#recurringusers
Plenty more graphs and stats on that page. Also read this for information about the type of people who use it:
Tor is never going to be used by tens of millions of people. It doesn't need to be used by tens of millions of people to serve its purpose and be successful.
I'm not sure why they only present that small subset of countries in their stats. I wish they'd provide more comprehensive stats.