1,000 employees worldwide at present. Their branch offices are in the United States, Ireland, United Kingdom, Argentina, the Czech Republic, Singapore and Poland. In recent years, service and high-tech-oriented businesses have prospered in Bratislava. Many global companies, including IBM, Dell, Lenovo, AT&T, SAP, and Accenture, have built outsourcing and service centres here. Reasons for the influx of multi-national corporations include proximity to Western Europe, skilled labour force and the high density of universities and research facilities. Other large companies and employers with headquarters in Bratislava include Amazon, Slovak Telekom, Orange Slovensko, Slovenská sporiteľňa, Tatra banka, Doprastav, Hewlett-Packard Slovakia, Henkel Slovensko, Slovenský plynárenský priemysel, Microsoft Slovakia, Mondelez Slovakia, Whirlpool Slovakia and Zurich Insurance Group Slovakia. Bratislava's geographical position in Central Europe has long made Bratislava a crossroads for international trade traffic. Various ancient trade routes, such as the Amber Road and the Danube waterway, have crossed territory of present-day Bratislava. Today, Bratislava is a road, railway, waterway and airway hub. Energy In 2012, Slovakia produced a total of 28,393 GWh of electricity while at the same time consumed 28 786 GWh. The slightly higher level of consumption than the capacity of production (- 393 GWh) meant the country was not self-sufficient in energy sourcing. Slovakia imported electricity mainly from the Czech Republic (9,961 GWh - 73.6% of total import) and exported mainly to Hungary (10,231 GWh - 78.2% of total export). Nuclear energy accounts for 53.8% of total electricity production in Slovakia, followed by 18.1% of thermal power energy, 15.1% by hydro power energy, 2% by solar energy, 9.6% by other sources and the rest 1.4% is imported. The two nuclear power-plants in Slovakia are in Jaslovské Bohunice and Mochovce, each of them containing two operating reactors. Before the accession of Slovakia to the EU in 2004, the government agreed to turn-off the V1 block of Jaslovské Bohunice power-plant, built-in 1978. After deactivating the last of the two reactors of the V1 block in 2008, Slovakia stopped being self-dependent in energy production. Currently there is another block (V2) with two active reactors in Jaslovské Bohunice. It is scheduled for decommissioning in 2025. Two new reactors are under construction in Mochovce plant. The nuclear power production in Slovakia occasionally draws the attention of Austrian green-energy activists who organise protests and block the borders between the two countries. Transportation There are four main highways D1 to D4 and eight expressways R1 to R8.