I'm in the UK and I would say they are earlier than the general norm back at home in Canada.
UK: around 2.
Canada: by 3.
Now my friends back in Canada mostly had girls and they all potty trained around 2. I think it was the influence of one of our European friends who's daughter pretty much potty trained herself after her 2nd birthday.
As for me, DS just turned 3 and we're not close to potty training. He had some hearing issues though and is behind in language. Our health visitor said not to push it right now as he works on language and when there is a new baby coming.
Interesting to hear that late 2, early 3 is the norm in your area.
I think it is a bit like breastfeeding/formula feeding in that there are just pockets or social circles where one is the norm. I have friends in the US and they all seem to potty train at 3.