Year	Number Of Units
1873	8690.00
1874	9419.00
1875	12494.0
1876	13654.0
1877	8488.00
1878	2381.00
1879	1285.00
1880	1431.00
1881	926.000
1882	1282.00
1883	995.000
1884	1347.00
1885	1673.00
1886	3082.00
1887	2413.00
1888	2534.00
1889	3476.00
1890	2545.00
1891	3553.00
1892	5203.00
1893	6460.00
1894	8921.00
1895	8436.00
1896	7945.00
1897	10797.0
1898	12924.0
1899	8501.00
1900	6149.00
1901	6295.00
1902	14051.0
1903	12313.0
1904	6981.00
1905	5312.00
1906	6514.00
1907	3717.00
1908	2610.00
1909	3429.00
1910	3524.00
1911	635.000
1912	499.000
1913	1579.00
1914	1287.00
1915	1326.00
1916	73.0000
1917	0.000000
1918	212.000
1919	744.000
1920	6809.00
1921	8856.00
1922	972.000
1923	3834.00
1924	10324.0
1925	4060.00
1926	16542.0
1927	18299.0
1928	23440.0
1929	11316.0
1930	14428.0
1931	14850.0
1932	16894.0
1933	20546.0
1934	10575.0
1935	10548.0
1936	11188.0