Valley town of Los Gatos, California. Skype is one of the best-known of several Estonian start-ups originating from Tallinn. Many start-ups have originated from the Institute of Cybernetics. In recent years, Tallinn has gradually been becoming one of the main IT centres of Europe, with the Cooperative Cyber Defence Centre of Excellence (CCD COE) of NATO, eu-LISA, the EU Digital Agency and the IT development centres of large corporations, such as TeliaSonera and Kuehne + Nagel being based in the city. Smaller start-up incubators like Garage48 and Game Founders have helped to provide support to teams from Estonia and around the world looking for support, development and networking opportunities. Tallinn receives 4.3 million visitors annually, a figure that has grown steadily over the past decade. The Finns are especially a common sight in Tallinn; on average, about 20,000–40,000 Finnish tourists visit the city between June and October. Most of the visitors come from Europe, though Tallinn has also become increasingly visited by tourists from the Asia-Pacific region. Tallinn Passenger Port is one of the busiest cruise destinations on the Baltic Sea, it served more than 520,000 cruise passengers in 2013. Eesti Energia, the national energy company,; Elering, the national electric power transmission system operator; Eesti Gaas, the national natural gas distribution company; Alexela Group, the country's largest private energy company, all have their headquarters in Tallinn. Tallinn is the financial centre of Estonia and also a strong economic centre in the Scandinavian-Baltic region. Many major banks, such as SEB, Swedbank, and Nordea, have their local offices in Tallinn. LHV Pank, an Estonian investment bank, has its corporate headquarters in Tallinn. Tallinn Stock Exchange, part of NASDAQ OMX Group, is the only regulated exchange in Estonia. Port of Tallinn is one of the biggest ports in the Baltic sea region, whereas the largest cargo port of Estonia, the Port of Muuga, which is operated by the same business entity, is located in the neighboring town of Maardu. Old City Harbour has been known as a convenient harbour since the medieval times, but nowadays the cargo operations are shifted to Muuga Cargo Port and Paldiski South Harbour. As of 2010, there was still a small fleet of oceangoing trawlers that operated out of Tallinn. Tallinn's industries include shipbuilding, machine building, metal processing, electronics, textile manufacturing. BLRT Grupp has its headquarters and some subsidiaries in Tallinn. Air Maintenance Estonia and AS Panaviatic Maintenance,