Thought this might be interesting to everyone. I took the stats from the CARMS match process and generated a first choice discipline to quota ratio. This ratio is used to roughly gauge how competitive a specialty is. If the ratio is 2.0 then there were 2 applicants that listed that discipline as their first choice for every 1 seat that was available in that discipline. In other words, the higher the ratio, the more competitive the specialty.
I took the past five years and put them side by side so people can look at how things may be changing.
https://www.dropbox.com/s/nct7mt9h7pjy7ap/2017 Year by Year Comparison of First Choice to Quota Ratios.png?dl=0
Note: I uploaded it to dropbox because the image dimensions are too big to upload to the forum.
Edit May.28.2015: Stats updated for this year!
Edit June.19.2016: Updated for 2016.
Edit July 4.2017: Updated for 2017.