Advanced Data Tables: 2017 Main Residency Match

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What does ranked mean in terms of the right most columns on Table 1? Does that mean that is the number of applicants that actually submitted apps initially? Never mind, its the number of programs the applicants ranked in total.
 
I started reading down the list and saw that dermatology PGY1 only had 11 programs. I thought that seemed way too low. But then in PGY2 the number of programs jumps up to 121. Can someone please explain how that works?
 
Interesting. I for some reason had assumed derm programs were always categorical. Thanks!!
 
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