Date	DCO2	DCH4	DN2O	DCC2	DCC3	DV	DS
1950	0	0.	0.	0	0	0	0
1960	10	0.2	0.02	0	0	0	0
1970	20	0.4	0.04	0	0	0	0
1980	30	0.6	0.06	0	0	0	0
1990    40	0.8	0.08	0	0	0	0
2000	50	1.0	0.1	0	0	0	0