21 2nd year Undergrad:
In my first year of uni I would usually have about 1-3 drinks (pints or shorts) every Saturday. This year it's more like 2-3 on a night out about once a month (depending on birthdays etc). I'd probably be drinking like I was in 1st year but 2nd year has meant moving a lot further away from £1 drinks night at the student union and pints at the local are about 5 times that....
I drink more (though not a particularly large amount) when I go back to my parents home (like 1-2 glasses of wine or a pint of beer every other day for a week-ish) because we're usually going out for meals or the pub more for the holidays.
That said, I've never been a big drinker on a consistent basis.