After the war, Shanghai's economy was restored—from 1949 to 1952, the city's agricultural and industrial output increased by 51.5% and 94.2%, respectively.[38] There were 20 urban districts and 10 suburbs at the time.[59] On 17 January 1958, Jiading, Baoshan, and Shanghai County in Jiangsu became part of Shanghai Municipality, which expanded to 863 km2 (333.2 sq mi). The following December, the land area of Shanghai was further expanded to 5,910 km2 (2,281.9 sq mi) after more surrou...