Year	Number Of Units
1857	8113.00
1858	7203.00
1859	6290.00
1860	7685.00
1861	6338.00
1862	4958.00
1863	5388.00
1864	5168.00
1865	8685.00
1866	12259.0
1867	13419.0
1868	14230.0
1869	11360.0
1870	9939.00
1871	12601.0
1872	15172.0
1873	16993.0
1874	14975.0
1875	15377.0
1876	11148.0
1877	11005.0
1878	8408.00
1879	10747.0
1880	9825.00
1881	19415.0
1882	19354.0
1883	20735.0
1884	18567.0
1885	15996.0
1886	14949.0
1887	20765.0
1888	20759.0
1889	21025.0
1890	15927.0
1891	20897.0
1892	22254.0
1893	19587.0
1894	15668.0
1895	17771.0
1896	16067.0
1897	15551.0
1898	15237.0
1899	18237.0
1900	15967.0
1901	22796.0
1902	25804.0
1903	25701.0
1904	27417.0
1905	31003.0
1906	29345.0
1907	29042.0
1908	22797.0
1909	24248.0
1910	23659.0
1911	26209.0
1912	29299.0
1913	29690.0
1914	29690.0
1915	37827.0