Year	Number Of Units
1873	4463.00
1874	4392.00
1875	5582.00
1876	5746.00
1877	3963.00
1878	1033.00
1879	501.000
1880	492.000
1881	419.000
1882	512.000
1883	391.000
1884	587.000
1885	764.000
1886	1262.00
1887	1021.00
1888	1202.00
1889	1545.00
1890	1253.00
1891	1561.00
1892	2051.00
1893	2573.00
1894	3466.00
1895	3497.00
1896	3370.00
1897	4870.00
1898	5618.00
1899	3730.00
1900	2536.00
1901	2446.00
1902	5349.00
1903	4837.00
1904	2894.00
1905	2085.00
1906	2863.00
1907	1442.00
1908	1028.00
1909	1167.00
1910	1283.00
1911	284.000
1912	200.000
1913	461.000
1914	373.000
1915	454.000
1916	16.0000
1917	0.000000
1918	92.0000
1919	222.000
1920	1936.00
1921	2431.00
1922	234.000
1923	1321.00
1924	2780.00
1925	1394.00
1926	4764.00
1927	5183.00
1928	6885.00
1929	3456.00
1930	4191.00
1931	4306.00
1932	5384.00
1933	5637.00
1934	3381.00
1935	3231.00
1936	3084.00