Year	All GHGs	Threshold	Minimum	Maximum	All GHGs with older radiative values for aerosols
1850		450	400	500
1855		450	400	500
1860		450	400	500
1865		450	400	500
1870		450	400	500
1875		450	400	500
1880		450	400	500
1885		450	400	500
1890		450	400	500
1895		450	400	500
1900		450	400	500
1905		450	400	500
1910		450	400	500
1915		450	400	500
1920		450	400	500
1925		450	400	500
1930		450	400	500
1935		450	400	500
1940		450	400	500
1945		450	400	500
1950		450	400	500
1955		450	400	500
1960		450	400	500
1965		450	400	500
1970	319.7	450	400	500	301.6
1975	329.2	450	400	500	313.1
1978	336.7	450	400	500	321.7
1979	339.8	450	400	500	325.2
1980	343.2	450	400	500	329.0
1981	345.2	450	400	500	331.5
1982	347.8	450	400	500	334.5
1983	350.3	450	400	500	337.5
1984	353	450	400	500	340.6
1985	355.4	450	400	500	343.5
1986	358	450	400	500	346.6
1987	360.5	450	400	500	349.6
1988	364.3	450	400	500	353.8
1989	367.1	450	400	500	357.1
1990	369	450	400	500	359.5
1991	372.1	450	400	500	362.2
1992	373.9	450	400	500	363.6
1993	375.6	450	400	500	364.8
1994	378.4	450	400	500	367.1
1995	381.5	450	400	500	369.7
1996	384.3	450	400	500	372.1
1997	386.5	450	400	500	373.8
1998	390.2	450	400	500	377.0
1999	393.6	450	400	500	379.9
2000	395.7	450	400	500	381.5
2001	397.4	450	400	500	383.6
2002	399.4	450	400	500	386.0
2003	402.3	450	400	500	389.2
2004	403.8	450	400	500	391.1
2005	406.3	450	400	500	394.0
2006	410.6	450	400	500	396.6
2007	414.6	450	400	500	398.8
2008	419.1	450	400	500	401.6
2009	422.7	450	400	500	403.4
2010	427.3	450	400	500	406.2
2011	431.5	450	400	500	408.7
2012	434.8	450	400	500	411.4