Here are the full datas:
| AAC | MP3 | MPC | Vorbis | FLAC | APE | TAK | WavPack
------|---------|---------|---------|---------|---------|---------|--------|---------
2001 | 7,42 | 28,71 | 29,95 | 22,94 | | | |
2002 | 5,60 | 32,32 | 29,60 | 25,89 | 35,56 | 57,41 | ----- | 1,85
2003 | 10,96 | 21,92 | 47,49 | 19,63 | 54,22 | 31,33 | ----- | 5,42
2004 | 11,14 | 28,01 | 28,45 | 20,38 | ----- | ----- | ----- | -----
2005 | 11,26 | 36,09 | 24,17 | 25,50 | 52,73 | 18,18 | ----- | 14,83
2006 | 12,67 | 46,04 | 9,68 | 27,39 | 52,66 | 8,31 | 0,46 | 32,33
2007 | 12,77 | 54,22 | 4,44 | 22,84 | 59,42 | 4,65 | 0,76 | 21,97
2008 | 16,25 | 56,19 | 3,80 | 17,66 | 65,59 | 4,29 | 4,46 | 14,52
Thanks to houyhnhnm who dig some old polls I didn't found myself.
Now, the difference between 2007 and 2008:
| 2007 | 2008 |
--------|---------|---------|------------
WavPack | 21,97 | 14,52 | -33,91 %
Vorbis | 22,84 | 17,66 | -22,68 %
MPC | 4,44 | 3,80 | -14,41 %
APE | 4,65 | 4,29 | -7,74 %
MP3 | 54,22 | 56,19 | 3,63 %
FLAC | 59,42 | 65,59 | 10,38 %
AAC | 12,77 | 16,25 | 27,25 %
TAK | 0,76 | 4,46 | 486,84 %
For the second consecutive year Vorbis and WavPack have both lost some attraction inside the HA.org basis. The most popular lossy and lossless formats in 2007 (MP3 and FLAC) have also increased their popularity. FLAC is cannibalizing the market with 2/3 of the voters. It's a unique situation in the whole HA history. The most impressive progress comes from TAK which appears now on the podium as the third most popular lossless format.
The old "elephants" which ruled the forum some years ago (MPC and Monkey's Audio) are slowly fading away but they have this year maintained most of their remaining users basis. They seem to have truly loyal users. AAC progressed very well this year after 5 years of relative stagnation.
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On my side my votes are for AAC + FLAC + one file per track. I haven't changed anything since 2008.