Year	Number Of Units
1867	671.000
1868	782.000
1869	1027.00
1870	749.000
1871	736.000
1872	1044.00
1873	1208.00
1874	2039.00
1875	1550.00
1876	1309.00
1877	997.000
1878	668.000
1879	580.000
1880	466.000
1881	516.000
1882	516.000
1883	533.000
1884	685.000
1885	792.000
1886	1044.00
1887	1155.00
1888	1415.00
1889	1825.00
1890	1670.00
1891	1700.00
1892	1523.00
1893	1522.00
1894	1660.00
1895	1847.00
1896	2209.00
1897	2521.00
1898	2633.00
1899	2680.00
1900	2405.00
1901	2352.00
1902	2731.00
1903	3450.00
1904	3695.00
1905	3645.00
1906	4210.00
1907	3631.00
1908	2887.00
1909	2665.00
1910	2758.00
1911	3212.00
1912	2869.00
1913	2318.00