IPCC (2021) AR6_WGI AnnexIII (1750-2000) + NOAA GML Annual Global Mean (2001-2023) --------------------------------------------- Year N2O(ppb) --------------- 1750 270.1 1850 272.1 1851 272.2 1852 272.3 1853 272.4 1854 272.5 1855 272.6 1856 272.7 1857 272.8 1858 272.9 1859 273.0 1860 273.2 1861 273.4 1862 273.6 1863 273.7 1864 273.9 1865 274.1 1866 274.2 1867 274.4 1868 274.6 1869 274.8 1870 274.9 1871 275.1 1872 275.3 1873 275.5 1874 275.7 1875 275.8 1876 276.0 1877 276.1 1878 276.3 1879 276.4 1880 276.6 1881 276.7 1882 276.8 1883 276.9 1884 277.0 1885 277.1 1886 277.2 1887 277.3 1888 277.4 1889 277.5 1890 277.6 1891 277.7 1892 277.8 1893 277.9 1894 278.1 1895 278.2 1896 278.3 1897 278.5 1898 278.6 1899 278.7 1900 278.9 1901 279.1 1902 279.3 1903 279.6 1904 279.9 1905 280.2 1906 280.5 1907 280.8 1908 281.1 1909 281.4 1910 281.8 1911 282.2 1912 282.5 1913 282.9 1914 283.2 1915 283.6 1916 283.9 1917 284.2 1918 284.4 1919 284.4 1920 284.5 1921 284.6 1922 284.8 1923 285.1 1924 285.2 1925 285.3 1926 285.3 1927 285.4 1928 285.5 1929 285.5 1930 285.6 1931 285.8 1932 285.9 1933 286.0 1934 286.1 1935 286.3 1936 286.4 1937 286.6 1938 286.9 1939 287.1 1940 287.3 1941 287.6 1942 287.9 1943 288.5 1944 288.7 1945 289.0 1946 289.2 1947 289.3 1948 289.3 1949 289.4 1950 289.5 1951 289.7 1952 289.8 1953 290.1 1954 290.4 1955 290.7 1956 291.0 1957 291.3 1958 291.6 1959 291.8 1960 292.1 1961 292.5 1962 292.8 1963 293.2 1964 293.6 1965 293.9 1966 294.4 1967 294.8 1968 295.2 1969 295.6 1970 296.0 1971 296.5 1972 296.9 1973 297.3 1974 297.8 1975 298.3 1976 298.8 1977 299.3 1978 299.8 1979 300.4 1980 301.1 1981 301.9 1982 303.1 1983 303.7 1984 304.3 1985 304.9 1986 305.8 1987 306.0 1988 306.7 1989 307.8 1990 308.7 1991 309.4 1992 309.9 1993 310.3 1994 310.8 1995 311.4 1996 312.3 1997 313.1 1998 313.9 1999 314.9 2000 315.9 2001 316.36 2002 316.94 2003 317.63 2004 318.26 2005 318.91 2006 319.82 2007 320.44 2008 321.50 2009 322.27 2010 323.19 2011 324.21 2012 325.05 2013 325.94 2014 327.09 2015 328.17 2016 328.95 2017 329.74 2018 330.90 2019 331.88 2020 333.03 2021 334.31 2022 335.65 2023 336.71