rowid,State / Territory,1790,1800,1810,1820,1830,1840,1850,1860,1870,1880,1890,1900,1910,1920,1930,1940,1950,1960,1970,1980,1990,2000,2010,2019
19,Iowa,,,,,,0.4,0.2,0.2,0.5,0.6,0.6,0.6,0.7,0.8,0.7,0.7,0.8,0.9,1.2,1.4,1.7,2.1,2.9,4.1