"Year"	"GHCN"	"IMO"
1901	4.6	NA
1902	4.6	NA
1903	3.9	NA
1904	4.6	NA
1905	4.7	NA
1906	4.3	NA
1907	4.1	NA
1908	4.7	NA
1909	4.2	NA
1910	3.9	NA
1911	4.9	NA
1912	5	NA
1913	4.8	NA
1914	3.9	NA
1915	5	NA
1916	4.5	NA
1917	4	NA
1918	4.1	NA
1919	3.5	NA
1920	3.8	NA
1921	3.6	NA
1922	4.3	NA
1923	4.2	NA
1924	4.2	NA
1925	4.4	NA
1926	5	NA
1927	5	NA
1928	5.7	NA
1929	5.6	NA
1930	4.7	NA
1931	4.9	NA
1932	5.6	NA
1933	5.5	NA
1934	5.4	NA
1935	5.2	NA
1936	5	NA
1937	5	NA
1938	5.3	NA
1939	6.3	NA
1940	5.1	NA
1941	6.3	NA
1942	5.5	NA
1943	4.8	NA
1944	4.9	NA
1945	6.1	NA
1946	5.5	NA
1947	4.5	NA
1948	4.6	NA
1949	3.8	3.8
1950	4.8	4.8
1951	4.1	4.1
1952	4.4	4.4
1953	5.3	5.3
1954	5	4.9
1955	4.4	4.4
1956	5.3	5.3
1957	5	5
1958	5	5
1959	5	5
1960	5.6	5.6
1961	5	4.9
1962	4.7	4.6
1963	4.9	4.9
1964	5.7	5.7
1965	5	5
1966	4.2	4.2
1967	4.2	4.1
1968	4.5	4.6
1969	4	4
1970	4.1	4.1
1971	4.5	4.5
1972	5.2	5.2
1973	4	4
1974	5	5
1975	4.2	4.2
1976	4.5	4.5
1977	4.4	4.4
1978	4.4	4.4
1979	2.9	2.8
1980	4.3	4.3
1981	3.4	3.4
1982	3.9	4
1983	3.4	3.4
1984	4	4
1985	4.4	4.4
1986	4.1	4.1
1987	5.3	5.4
1988	4.1	4.1
1989	3.8	3.8
1990	4.4	4.4
1991	5	5
1992	4.2	4.2
1993	4.4	4.4
1994	4.1	4.1
1995	3.8	3.8
1996	5	5
1997	5.1	5.1
1998	4.7	4.7
1999	4.5	4.5
2000	4.5	4.5
2001	5.2	5.2
2002	5.4	5.4
2003	6.1	6.1
2004	5.6	5.6
2005	5.1	5.1
2006	5.4	5.4
2007	5.5	5.5
2008	5.3	5.3
2009	5.6	5.6
2010	5.9	5.9
2011	5.4	5.4
2012	5.4	5.5
2013	5	4.9
2014	6	6