Bryson 1988 Observed Optical Depth

YEAR	AOD
1883	0.015
1884	0.048
1885	0.066
1886	0.044
1887	0.013
1888	0.024
1889	0.028
1890	0.035
1891	0.042
1892	0.032
1893	0.005
1894	0.027
1895	0.01
1896	0.018
1897	0.013
1898	0.015
1899	0.015
1900	0.019
1901	0.01
1902	0.016
1903	0.068
1904	0.038
1905	0.021
1906	0.026
1907	0.039
1908	0.012
1909	0.01
1910	0.005
1911	0.01
1912	0.071
1913	0.071
1914	0.03
1915	0.007
1916	0.015
1917	0.03
1918	0.01
1919	0.02
1920	0.011
1921	0.006
1922	0.011
1923	0.021
1924	0.012
1925	0.024
1926	0.002
1927	0.012
1928	0.018
1929	0.023
1930	0.016
1931	0.017
1932	0.002
1933	0.006
1934	0.008
1935	0.004
1936	0.013
1937	0.009
1938	0.01
1939	0.008
1940	0.007
1941	0.006
1942	0.018
1943	0.012
1944	0.013
1945	0.009
1946	0.019
1947	0.019
1948	0.022
1949	0.025
1950	0.027
1951	0.024
1952	0.025
1953	0.03
1954	0.031
1955	0.032
1956	0.028
1957	0.027
1958	0.021
1959	0.018
1960	0.029
1961	0.032
1962	0.029
1963	0.046
1964	0.052
1965	0.047
1966	0.051
1967	0.046
1968	0.049
1969	0.031
1970	0.03
1971	0.027
1972	0.032
1973	0.03
1974	0.031
1975	0.04
1976	0.022
1977	0.013
1978	0.012
1979	0.025
1980	0.033