I also hadn't thought about it as a % of income. This is a big travel year for us - planning our first Disney trip this summer, and we did a trip overseas to visit family earlier in the year, as well as a weekend in Vegas for me and DH last fall, so we are going to wind up at something like 10% of our take home pay (after retirement contributions etc) spent on travel between July 2016-June 2017. I think that going forward we will be spending a similar amount.
Just when DH and I were both hitting our strides professionally, we decided to have a second kid and our disposable income took a dip for a few years while I worked part time and had daycare payments. Our vacations have been pretty modest as a result- time at my parents' lake house, a few weekends away, a road trip through neighboring states. I think we will be able to get to more interesting locales now that we have more income and fewer expenses - I've been back at work full time for a little over a year, and the little one will be in kindergarten next year.
I will say that when we travel, we tend to splurge and go upscale - I would rather spend 3 nights at a great hotel than 5 at more budget friendly place.