According to research by Cisco, Bulgaria ranks fifth in the world and third in Europe for Internet connection speed. Most of the Eastern European countries have shown a tendency for high quality in comparison to the countries that have more developed economies. Fiber-optic cable connecting and ADSL connections are the most popular choices for Bulgarians when it comes to Internet access. The prices of ADSL and fiber-optic cable connections differ slightly, starting at approximately 6.5-8 euros for a 12-15Mbps connection and not exceeding 30-35 euros for a 100Mbps connection. The prices for internet vary around Bulgaria depending on the subscription (business or individual), speed and location. Bulgaria still has a limited data center infrastructure developed. Currently there are 16 colocation data centers in Sofia and until recently there were none in Plovdiv. In September 2012 EVN found a data center in Plovdiv but there are still none available for commercial use.