You said the past 10 years, so that's the figure I quoted. 6 out of 12 is better - since the introduction of the split, it's something like 11 times out of 23 we've made it, so more or less a 50% success rate over the years. Prior to that, our league finishes would also be a very mixed bag.
It's perfectly reasonable to hope for top 6, to expect it is pushing things. If you based your expectations on our budget and attendances, we're definitely looking at bottom 6.