Hello, the timetable for December is not yet posted in the website, but it should be similar to any Sunday.
The first trains are at:
5.32, 6.07, 6.42, 7.22 in the morning, then the frequency is every 20 minutes.
Last train is at 11.41 pm.
You can check difference between daily and Sunday trains here: viewtopic.php?t=1288