1874 8.9 1875 11.8 1876 15.3 1877 11.5 ———— Ten-year average 11.7 1878–1887. 1878 9.7 1879 10.3 1880 12.3 1881 12.1 1882 10.9 1883 11.3 1884 10.5 1885 9.7 1886 11.1 1887 12.4 ———— Ten-year average 11.0 1888–1897. 1888 12.3 1889 12.5 1890 9.9 1891 7.4 1892 11.8 1893 16.5 1894 11.6 1895 10.8 1896 10.7 1897 14.2 ———— Ten-year average 11.8 1898–1907. 1898 14.6 1899 12.0 1900 13.2 1901 11.8 1902 11.6 1903 13.0 1904 10.2 1905 10.4 1906 13.4 1907 11.4 ———— Ten-year average 12.2 1908–1917. 1908 8.4 1909 11.3 1910 15.2 1911 11.2 1912 10.9 1913 13.2 1914 11.7 1915 9.6 1916 11.5 1917 9.7 ———— Ten-year average 11.3