Zero - we quite like staying at home!
And we lack the sense of entitlement and micawberesque optimism that those with charmed lives can have (not all those with charmed lives, obviously). We are only too aware of what life can be like, and that marks you. We are also ridiculously risk averse. My job involves international travel and I suck it up, but I don't embrace it. I think, if you had to sum it up in one word, that word would be 'worry'. However, my kids also see the example of what we made of our lives, despite the drag caused by worry etc. So it's not all bad. But I do think that 2/3 of them, despite my job being a counter example, don't automatically see the world as being their oyster. And they haven't really travelled (I travel for work, no bloody way am I ever going to go to a airport through choice). They go to London more than any of their friends though - but that's not an example of them being more cosmopolitan it's an example of my homing instinct. And the fact that if shows are your thing, you go to London or you miss out.
DD1 will have to go far away for university and work, possibly. But at this point I can't see DS ever moving outside the county. DD2 is already planning her life abroad though so she hasn't been infected by our ineffectualness. (It's not that she doesn't like us, I think, it's more to do with what she wants to do when she is an adult although since that is a ridiculous pipe dream I doubt it will stay that way).