Above is the graph of new novels published in various genres. It uses the numbers presented in Gardner Dozois’s The Year’s Best Science Fiction books, which in turn are taken from Locus Magazine’s statistics.
Basically the last few years have seen
- a steady rise in new science fiction novels
- a stabilising of fantasy and horror novels
- a continuing decrease in paranormal romance
For the combined genres, the decrease continues since 2012. So by increasing science fiction is taking a greater share of the market.
But having said that, the overall numbers reflect what I have seen of how bookshops handle the genres – less space and less prominent settings for the genres.
As to why this is happening, I can only speculate. What I do know is that there has been a push for science fiction in the market place from people interested in science. This will have obviously contributed to the recent success of science fiction. By how much, I don’t know.
Rosie Oliver 
How cool, thank you! What about women’s fiction or chicklit? Or humor?
Welcome Ana to my little blog.
Unfortunately I don’t know the answers to your questions, not where to find the information. The numbers gathered here have been courtesy of people who publish that statistics year on year. All I’ve done is put the yearly statistics into a single graph. As you realised, this made interesting reading in itself. I hope you enjoy the other articles.
The closest I came to doing a romance story was Flame of Desire, which was published earlier this year and you can read at: http://www.kraxon.com/flame-of-desire/