The Austrian Statistics Center reported on Wednesday that on January 1, 2013, there were 8,451,860 people living in Austria, that is 0.52 percent, or 43,739 more people than at the beginning of 2012. The increase was due to more immigration, as there were 484 fewer births compared to the previous period. In January, around 11.9 percent of people living in Austria were foreigners. Population growth continued after January 1, the center stated. On April 1, there were around 12,694 people living in Austria, bringing the total up to 8.465 million. In 2012, all provinces had population increase except for Carinthia. Vienna had the biggest increase - at the start of 2013, there were 1,741,246 people living there, 24,162 or 1.41 percent more than the previous year. The biggest population losses were recorded in the inner alpine and peripheral regions. Districts in Styria province such as Muerzzuschlag (around 100 kilometres southwest of Vienna), Leoben (164 kilometres from Vienna in the same direction), or Zwettl in Lower Austria province (120 kilometres northwest of Vienna) all saw clear decreases. The average age of Austrian citizens or people living in Austria also continued to rise. In 2013, it was 42 years, which was 0.1 percent more than the year before, and over two years more than ten years ago. As of January 2013, there were 1,699,918 children and adolescents under 20 and 5,224,685 people between 20 and 65. There were also 1,295 people - 210 men and 1,085 women - who were at least 100 in January. This was 143 more than at the beginning of 2012.