First, some criteria:


The product is an application and is heavy on user interaction.  Think web 2.0 or mobile application, not a marketing or commerce site, or some back-end tool with only command-line access.
I realize that it is not always clear who is a UX person and who is a developer (nor should it be), so I'd like to focus on overall team resource allocation.  For instance, "My team puts 25% of our resource-time into UX design/research vs. 75% of our resource-time in development."  
I am not distinguishing between front-end and back-end development as it is too platform-specific and difficult to tease out the dividing like.  It's all software development for this question.
EDIT: Development is occurring in an agile-esque, ongoing manner, rather than a one-time, big-bang delivery.


So:


How does this proportion commonly look in practice?
How should it look?  Or, better yet, what has been the proportion on successful teams?


(I realize this is a classic "it depends" question, but I suspect that there is some use in asking when constrained by a few parameters, and allowing that conditions will vary.  I am also open to suggestions to further constrain the question.)


Question: Where is my power going?
Answer: First off, you are not billed by the city, you are billed by the electric utility. Unless you're in Canada and then I'm not sure.

In cases like this you do not call an electrician, you call the utility that billed you. They take high bill complaints very seriously, at least around here they do (NY State). 
They will do what is necessary to find out what the problem is. If it does happen to be on your end they'll tell you so.