I'm chuckling at some of the naive comments on here. Teenagers have always had access to drink. The 70's kids drank 20/20, the 80's ones drunk white lightening and the 90's kids drunk alco pops (do you remember when Hootch and Reef first come out
)
We are making a massive assumption that a whole bottle of vodka was given to the boy who ended up in hospital. He might have been given a mini bottle (like one shot) and brought alcohol himself. We don't know the details and its wrong to judge the parents based on what the OP has written.
The statistic to me sounds normal.
Drugs and alcohol are very easily accessible for teenagers - parent drink cabinet, older siblings purchasing it or waiting around corner shops for someone to buy it I didn't do this 
I left school in 1999 and drinking alcohol on Friday nights was very normal during years 9-11. It was scary that our year became 'bored' of alcohol and turned to drugs by the time I was in Year 11. I lived in a nice ish area, albeit a small town with not a lot to do, and smoking weed was very normal in my school. Of course not everyone, but I would say a good 50% of the pupils in my year had tried weed.
I recall a good 20 odd girls on our last day of school taking ecstasy as a celebration of leaving
. These were the ones who had strict parenting. The ones that didn't get bladdered or high, were the ones whose parents had taken a sensible drinking approach (I recall my mum buying me a couple of bottles of Budweiser for my last day at school).
I know my experience is anecdotal but definitely worth mentioning that if kids want to drink they will find a way to drink. AND that drug availability is rife in most areas. Someone will know someone who sells weed or pills.
I intend to parent the same as my parents did and have a healthy attitude towards drinking, making it normal but not taboo. But I'm worried when my dd reaches her teens, it scares me what might happen.