same here, I don't know many people who stop at 1yr, either it happens in the first few weeks or months due to low milk supply, low weight gain, breast/nipple infection, poor suck/latch/seal etc or mum goes back to work and can't pump or hasn't the time to so baby goes to formula at 4-6mths or the LO self-weans a lot later than 12 mths....in my case it was 16-18mths but I was out of the house in FT work so it probably would have been a lot later had I been more accessible down through the months ;-)
S x