year	Year_since_1979	Extent	Mean_temp_anomaly	Mean_global_temperature
1979	0	7.22	0.17	14.970000
1980	1	7.86	0.28	15.080000
1981	2	7.25	0.33	15.130000
1982	3	7.45	0.13	14.930000
1983	4	7.54	0.31	15.110000
1984	5	7.11	0.16	14.960000
1985	6	6.93	0.12	14.920000
1986	7	7.55	0.19	14.990000
1987	8	7.51	0.34	15.140000
1988	9	7.53	0.40	15.200000
1989	10	7.08	0.29	15.090000
1990	11	6.27	0.44	15.240000
1991	12	6.59	0.42	15.220000
1992	13	7.59	0.23	15.030000
1993	14	6.54	0.24	15.040000
1994	15	7.24	0.32	15.120000
1995	16	6.18	0.46	15.260000
1996	17	7.91	0.34	15.140000
1997	18	6.78	0.47	15.270000
1998	19	6.62	0.63	15.430000
1999	20	6.29	0.42	15.220000
2000	21	6.36	0.42	15.220000
2001	22	6.78	0.54	15.340000
2002	23	5.98	0.63	15.430000
2003	24	6.18	0.62	15.420000
2004	25	6.08	0.54	15.340000
2005	26	5.59	0.69	15.490000
2006	27	5.95	0.63	15.430000
2007	28	4.32	0.66	15.460000
2008	29	4.73	0.53	15.330000
2009	30	5.39	0.64	15.440000
2010	31	4.93	0.72	15.520000
2011	32	4.63	0.60	15.400000
2012	33	3.63	0.63	15.430000
2013	34	5.35	0.65	15.450000
2014	35	5.29	0.74	15.540000
2015	36	4.68	0.87	15.670000
2016	37	4.72	NA	NA