Write a question about the following article: According to Eurostat, 82.3% per cent of the population live in privately owned and owner-occupied homes, ranking it as 12th List of countries by home ownership rate globally. It is down from a recent peak of 87.6% in 2008, and has been steadily falling since. The number of Internet users has increased rapidly since 2000—from 430,000 their number grew to 1.55 million in 2004, and 3.4 million (48 per cent penetration rate) in 2010. Bulgaria has the third-fastest average Broadband Internet speed in the world after South Korea and Romania with an average speed of 1,611 KBps.  Currently there are three active mobile phone operators—Mobiltel, Telenor and Vivacom, Mtel is the largest one with 5.2 million users as of 2010, Telenor has 3,9 million as of 2007 and Vivacom over 1 million.

Question about the article:
How many more million are using the internet in 2010 compared to 2004?