Sofia is the economic heart of Bulgaria and home to most major Bulgarian and international companies operating in the country, as well as the Bulgarian National Bank and the Bulgarian Stock Exchange - Sofia. The citys GDP PPS per capita at current market prices stood at €26,700 ($35,500) in 2013, which was 100% of the then EU average, according to Eurostat data - well above the same years national average of 47%. The city and its surrounding Yugozapaden NUTS II planning region had a per capita PPS GDP of €20,600 in 2014, higher than any other region in the country. In 2008, the average per capita annual income was 4,572 leva ($3,479). For the same year, the strongest sectors of the citys economy in terms of annual production were manufacturing ($5.5 bln.), metallurgy ($1.84 bln.), electricity, gas and water supply ($1.6 bln.) and food and beverages ($778 mln.). Economic output in 2011 amounted to 15.9 billion leva, or $11.04 billion. The average monthly gross wages paid in December 2015 amount to €645, the highest in Bulgaria and the lowest among EU capitals.. What percentage of the 2013 national average was the EU average GDP PPS per capita at current market prices?