I'm assuming you're not going to get a whole ton of response to your question for a variety of reasons:
1. Has been asked and answered and picked to death pretty frequently over the months/years. Wouldn't be tough to search for.
2. Salary changes so much based on type of nursing, geographic location. Cost of living as well, factors heavily into this. Easy to look up a cost of living calculator and google average RN pay in your state, put 2 and 2 together and determine a rough ballpark
3. You're polling nurses from multiple countries, and from age 18-retirement. My data from 7 years ago might be sort of relevant if you live in New England. Polling the new grads would be best, especially if you only poll ones working in your area. Knowing what a 65 year old's salary started at when she was 18, well, that's interesting historic data honestly, but it's not going to have any relevance to you figuring out what salary you should accept.
4. There are geographic areas where if you can get a hospital job as a new grad you take the heck out of it, because there won't be another one rolling along. My father had to make a phone call to get me my first job at a hospital as a new grad. So they could've offered me minimum wage and I would've asked when I could start. New England, especially cities, NYC, Boston, CT, etc. can be tough markets to break into without experience.
But to answer the question you actually asked, I started out in 2011 making $27.50/h as a full time RN in Telemetry/Stepdown, plus differentials and such. This was in New England, as stated above, and was middle of the road for similar salaries at other area hospitals at the time.
I'd like to add that cost of living where I'm from is pretty high. Not NYC or Southern California high, but high enough so I don't look at people making $22/h in Ohio and say OMG THAT'S NO MONEY. I usually think, well, what does an apartment cost out there, because I bet it's not 1200 a month even with roommates. Hell, their $22 is going way further than my $27, or so it seems.