Year	Diameter
1866	608
1867	617
1868	625
1869	636
1870	657
1871	691
1872	728
1873	784
1874	816
1875	876
1876	949
1877	997
1878	1027
1879	1047
1880	1049
1881	1018
1882	1021
1883	1012
1884	1018
1885	991
1886	962
1887	921
1888	871
1889	829
1890	822
1891	820
1892	802
1893	821
1894	819
1895	791
1896	746
1897	726
1898	661
1899	620
1900	588
1901	568
1902	542
1903	551
1904	541
1905	557
1906	556
1907	534
1908	528
1909	529
1910	523
1911	531