0, but only because all of our interns are juniors and seniors (or grad students). In our area, CCs top out at the sophomore level. I would say the vast majority of our interns come from the local, 4 year state schools. We're generally not importing kids from "Top Schools". There's a good chance a good portion of our interns did indeed attend a CC at one time; that's a very common path to a 4 year degree here.
In finance, there is a rule-of-thumb called the rule of 72. Basically, 72/X = # of years to double, where X is the compounded rate of return.
Solving for your request, 72/X = 5, X = 14.4%.
So to double your investment in 5 years, you need to find something that will give you 14.4% return for 5 years in a row. That high of rate (in this climate) would require a fairly risky investment.
I'm in the US and pay roughly 3.5% of my gross salary as my portion of the insurance premium. I opted for the cheaper HMO (Kaiser) insurance though. My employer pays the other 2/3rds of the premium. (I'm single, no kids)
My vote is somewhere between "mortality" or "fear of our own mortality". I'd like to think the humans to transform into a form of asceticism if the bottom layers of Maslow's hierarchy were no longer a daily/hourly issue and we knew absolutely that we had long enough to achieve the top layers of the pyramid.