Harbin has the largest economy in Heilongjiang province.[12] In 2013, Harbin's GDP totaled RMB501.08 billion, an increase of 8.9 percent over the previous year.[90] The proportion of the three industries to the aggregate of GDP was 11.1:36.1:52.8 in 2012. The total value for imports and exports by the end of 2012 was US$5,330 million.[12] In 2012, the working population reached 3.147 million. In 2015, Harbin had a GDP of RMB 575.12 billion.[91]The chernozem soil in Harbin, called "black ...