I don't know which scares me more -- that I have the means to do a statistical analysis such as this, or that I have the desire. I want to blame it on the way my job has warped my brain, but I think really it's probably just me.
In 2005 I read 51 fandoms, although the top 4 (Starsky & Hutch, Gundam Wing, Herclues and Yami no Matsuei) accounted for about 75% of the total volume. Hell, S&H by itself was 60% and I only started reading it in mid-August.
The Numbers for 2005: Year of the WTF? fandom
958 - Starsky & Hutch
105 - Gundam Wing
102 - Hercules
84 - Yami no Matsuei
51 - Beatles RPS
38 - Harry Potter
37 - Due South
27 - Lord of the Rings
18 - X-files
16 - Saiyuki
14 - Death Note
14 - Gravitation
13 - Star Wars
10 - Slayers
10 - X-men
9 - Firefly
9 - Man From U.N.C.L.E.
9 - Star Trek
8 - Angel
8 - ElfQuest
8 - Ranma
5 - Hikaru no Go
5 - Ocean's Eleven
4 - Sherlock Holmes
4 - Hornblower
4 - Inu Yasha
3 - Spirited Away
3 - Weib Kreuz
2 - Beauty and the Beast
2 - Daria
2 - Fruits Basket
2 - Futurama
2 - Spiderman
2 - X
1 - All About Eve
1 - Anne of Green Gables
1 - Batman (comic-verse)
1 - Batman Begins
1 - Calvin and Hobbes
1 - Cowboy Bebop
1 - Gilmore Girls
1 - Greek Mythology
1 - Jeeves and Wooster
1 - Joan of Arcadia
1 - Lost
1 - Mulan
1 - Noir
1 - Prince of Tennis
1 - Singin' In the Rain
1 - The Little Mermaid
1 - The Princess Bride