MaunaLoa.CO2

Default atmospheric CO2 concentration from 1902 to 2099 (updated 01/08/2022)
Year     CO2 (ppm by volume)
============================
  1902  297.4
  1905  298.2
  1912  300.7
  1915  301.3
  1924  304.5
  1926  305.0
  1929  305.2
  1932  307.8
  1934  309.2
  1936  307.9
  1938  310.5
  1939  310.1
  1940  310.5
  1944  309.7
  1948  310.7
  1953  311.9
  1954  314.1
  1958  315.29
  1959	315.98
  1960	316.91
  1961	317.64
  1962	318.45
  1963	318.99
  1964	319.62
  1965	320.04
  1966	321.37
  1967	322.18
  1968	323.05
  1969	324.62
  1970	325.68
  1971	326.32
  1972	327.46
  1973	329.68
  1974	330.19
  1975	331.12
  1976	332.03
  1977	333.84
  1978	335.41
  1979	336.84
  1980	338.76
  1981	340.12
  1982	341.48
  1983	343.15
  1984	344.85
  1985	346.35
  1986	347.61
  1987	349.31
  1988	351.69
  1989	353.2
  1990	354.45
  1991	355.7
  1992	356.54
  1993	357.21
  1994	358.96
  1995	360.97
  1996	362.74
  1997	363.88
  1998	366.84
  1999	368.54
  2000	369.71
  2001	371.32
  2002	373.45
  2003	375.98
  2004	377.7
  2005	379.98
  2006	382.09
  2007	384.02
  2008	385.83
  2009	387.64
  2010	390.1
  2011	391.85
  2012	394.06
  2013	396.74
  2014	398.81
  2015	401.01
  2016	404.41
  2017	406.76
  2018	408.72
  2019	411.66
  2020	414.24
  2021	416.45
  2025  424.45
  2099  572.45