Year	Thousand Miles
1877	2.60000
1878	6.30000
1879	1.10000
1880	10.9000
1881	14.8000
1882	10.4000
1883	8.20000
1884	7.30000
1885	4.10000
1886	7.40000
1887	17.0000
1888	6.40000
1889	10.7000
1890	6.10000
1891	7.60000
1892	3.60000
1893	10.8000
1894	7.90000
1895	3.50000
1896	5.90000
1897	2.90000
1898	3.30000
1899	4.80000
1900	8.60000
1901	6.60000
1902	8.80000
1903	9.70000
1904	13.3000
1905	9.70000
1906	10.3000
1907	10.9000
1908	5.70000
1909	8.70000
1910	9.40000
1911	11.1000
1912	8.40000
1913	8.30000
1914	7.70000
1915	3.90000
1916	3.80000
1917	3.30000
1918	2.00000
1919	1.50000
1920	2.70000
1921	1.00000
1922	1.80000
1923	3.60000
1924	2.00000
1925	2.90000
1926	3.40000
1927	3.40000
1928	3.00000
1929	1.30000
1930	0.800000
1931	-0.100000
1932	-1.40000
1933	-2.70000
1934	-3.30000
1935	-3.20000
1936	-2.80000
1937	-1.80000
1938	-3.20000
1939	-3.00000
1940	-2.40000
1941	-2.40000
1942	-4.00000
1943	-0.900000
1944	-0.300000
1945	-0.400000
1946	0.000000
1947	-0.700000
1948	-0.200000
1949	0.000000
1950	-0.900000
1951	-0.500000
1952	-1.20000
1953	-0.900000
1954	-1.20000
1955	-1.60000
1956	-1.30000
1957	-2.70000
1958	-1.70000
1959	-1.40000
1960	-2.20000
1961	-2.30000
1962	-3.10000
1963	-1.80000