Bulgaria has an extensive, but antiquated telecommunications network which requires substantial modernization. Telephone service is available in most villages, and a central digital trunk line connects most regions. Currently there are three active mobile phone operators - A1 Bulgaria, Telenor (Bulgaria) and Vivacom. Since 2000, a rapid increase in the number of Internet users has occurred - from 430,000 they grew to 1,545,100 in 2004, and 3.4 million (48% penetration rate) in 2010. In 2017, the Internet users in Bulgaria are 4.2 million people (59.8% penetration rate). Bulgaria had the 3rd fastest Average Broadband Internet Speed in the world, after Romania and South Korea, in 2011. In 2017, Bulgaria ranks 27th in the world in the Mean Download Speed chart with 17.54 Mbit/s, ranks 31st in the world in the Average Monthly Broadband Cost chart with $28.81, and holds the 18th position in the world in the Speed/Cost Ratio with as much as 0.61.
Answer this question: Which year had the largest number of internet users, 2010 or 2004?