Statistics

January

 * 8 000 000 worldwide subscribers
 * 2 000 000 American Subscribers
 * 1 500 000 Europe Subscribers
 * 3 500 000 Asian Subscribers

Note: Figures are named, "more than", hence the lacking math.

Source: Blizzard Press Release

July

 * 9 000 000 worldwide subscribers

Source: Blizzard Press Release

February

 * 700,000 copies sold in respective market including Korea (Not released in Europe yet)
 * 263,863 concurrent players on the US realms at peak time
 * 100,000 concurrent players on the Korean realms at peak time
 * 150,000 messages posted on the American support forums

Source: Ny Times article, February 10th 2005

December

 * 5 000 000 worldwide subscribers

Source: Blizzard Press Release

November

 * 240,000 copies sold across North America, Australia and New Zealand.

Source: Ny Times article, February 10th 2005