IPCC (2021) AR6_WGI AnnexIII (1750-1983) + NOAA GML Annual Global Mean (1984-2023) --------------------------------------------- Year CH4(ppb) ----------------- 1750 729.20 1850 807.60 1851 807.80 1852 808.50 1853 809.80 1854 811.10 1855 812.70 1856 814.20 1857 815.80 1858 817.70 1859 819.80 1860 821.70 1861 823.80 1862 826.40 1863 829.60 1864 833.00 1865 836.30 1866 839.80 1867 843.40 1868 846.70 1869 849.60 1870 851.90 1871 853.40 1872 854.70 1873 855.60 1874 857.30 1875 858.90 1876 860.30 1877 861.90 1878 863.60 1879 865.80 1880 868.20 1881 870.50 1882 872.80 1883 875.10 1884 877.70 1885 880.50 1886 883.40 1887 886.50 1888 889.50 1889 892.70 1890 895.90 1891 899.20 1892 903.10 1893 906.80 1894 910.00 1895 912.80 1896 914.30 1897 915.90 1898 918.60 1899 921.90 1900 925.10 1901 928.40 1902 932.30 1903 936.40 1904 941.70 1905 947.10 1906 952.70 1907 958.80 1908 963.70 1909 969.00 1910 974.40 1911 979.10 1912 983.30 1913 985.90 1914 988.30 1915 991.10 1916 998.10 1917 1003.20 1918 1009.80 1919 1017.30 1920 1024.80 1921 1031.90 1922 1038.80 1923 1044.80 1924 1049.20 1925 1051.90 1926 1053.30 1927 1055.50 1928 1060.40 1929 1066.40 1930 1072.40 1931 1077.20 1932 1081.70 1933 1086.30 1934 1091.50 1935 1096.80 1936 1101.60 1937 1106.10 1938 1110.40 1939 1116.70 1940 1119.90 1941 1123.00 1942 1128.00 1943 1132.50 1944 1136.10 1945 1139.10 1946 1143.50 1947 1149.50 1948 1155.50 1949 1160.20 1950 1163.70 1951 1168.60 1952 1174.20 1953 1183.20 1954 1194.30 1955 1206.50 1956 1221.00 1957 1235.70 1958 1247.30 1959 1257.20 1960 1264.00 1961 1269.30 1962 1282.50 1963 1300.70 1964 1317.30 1965 1331.00 1966 1342.20 1967 1354.20 1968 1371.60 1969 1389.30 1970 1411.00 1971 1431.10 1972 1449.20 1973 1462.80 1974 1476.10 1975 1491.70 1976 1509.10 1977 1527.60 1978 1546.90 1979 1566.10 1980 1584.90 1981 1602.60 1982 1618.70 1983 1632.60 1984 1644.85 1985 1657.29 1986 1670.09 1987 1682.70 1988 1693.15 1989 1704.53 1990 1714.43 1991 1724.82 1992 1735.47 1993 1736.50 1994 1742.07 1995 1748.88 1996 1751.28 1997 1754.53 1998 1765.54 1999 1772.33 2000 1773.33 2001 1771.22 2002 1772.66 2003 1777.33 2004 1777.05 2005 1774.16 2006 1774.96 2007 1781.38 2008 1787.01 2009 1793.53 2010 1798.93 2011 1803.15 2012 1808.12 2013 1813.41 2014 1822.57 2015 1834.26 2016 1843.12 2017 1849.58 2018 1857.33 2019 1866.58 2020 1878.93 2021 1895.26 2022 1911.82 2023 1922.41