the population of Bucharest for whom data are available is Romanian. Other significant ethnic groups are Romani, Hungarians, Turks, Jews, Germans (mostly Regat Germans), Chinese, Russians, Ukrainians, and Italians. A relatively small number of Bucharesters are also Greeks, Armenians, Bulgarians, Albanians, Poles, French, Arabs, Africans (including the Afro-Romanians), Vietnamese, Filipinos, Nepalis, Afghans, Sri Lankans, Bangladeshis, Pakistanis, and Indians. 226,943 people did not declare their ethnicity. In terms of religious affiliation, 96.1% of the population for whom data are available is Romanian Orthodox, 1.2% is Roman Catholic, 0.5% is Muslim, and 0.4% is Romanian Greek Catholic. Despite this, only 18% of the population, of any religion, attends a place of worship once a week or more. The life expectancy of residents of Bucharest in 2015 was 77.8 years old, which is 2.4 years above the national average. Economy Bucharest is the centre of the Romanian economy and industry, accounting for around 24% (2017) of the country's GDP and about one-quarter of its industrial production, while being inhabited by 9% of the country's population. Almost one-third of national taxes is paid by Bucharest's citizens and companies. The living standard in the Bucharest-Ilfov region was 145% of the EU average in 2017, according to GDP per capita at the purchasing power parity standard (adjusted to the national price level). Bucharest area surpassed, on comparable terms, European metropolitan areas such as Budapest (139%), Madrid (125%), Berlin (118%), Rome (110%), Lisbon (102%), or Sofia (79%), and more than twice the Romanian average. After relative stagnation in the 1990s, the city's strong economic growth has revitalised infrastructure and led to the development of shopping malls, residential estates, and high-rise office buildings. In January 2013, Bucharest had an unemployment rate of 2.1%, significantly lower than the national unemployment rate of 5.8%. Bucharest's economy is centred on industry and services, with services particularly growing in importance in the last 10 years. The headquarters of 186,000 firms, including nearly all large Romanian companies, are located in Bucharest. An important source of growth since 2000 has been the city's rapidly expanding property and construction sector. Bucharest is also Romania's largest centre for information technology and communications and is home to several software companies operating offshore delivery centres. Romania's largest stock exchange, the Bucharest Stock Exchange, which was merged in December 2005 with the Bucharest-based electronic stock exchange Rasdaq, plays a major role in the city's economy. International supermarket chains such