I will tell you our vacations for the last 18 months.
October 2011 all 5 of us at Disney for 11 days $7,000
January 2012 just the 2 of us at Disney $2,000
April 2012 just the 2 of us at Disney $2,000
October 2012 all 5 of us at Disney for 9 days $6,000
April 2013 just the 2 of us at Disney $2,000
So if you just count from October to October (1 year of that) it would be $17,000
But we aren't planning any more trip until April 2014 going to St Thomas for 9 days and that will be around $6,000 for the 2 of us.
We don't normally spend $17,000 a year on vacation. It just turned out that way last year. Usually we take one good one every year.