Strange Horizons magazine has an interesting online article on the recent trends of speculative book publishing. It was written by Mr. Valentin D. Ivanov, a Bulgarian professional astronomer, folklorist and speculative fiction writer.

Mr. Ivanov's method was to survey the Notable Books received for review since about 1998 by Locus Online magazine, since they are highly regarded publication and have a broad view of what is speculative fiction. He tabulated and graphed the data for your viewing. He divided the books into 18 categories, including genres of speculative fiction, non-fiction and poetry.

In general, all categories are in a pleasing rise, with the exception of anthologies and collections, which are flat or slightly negative. The article also gives figures for the proportion of sequels published.