_id	Year	Tnow	Tlag1	Tlag2	DT
1	1960	15.87161661	NA	NA	NA
2	1961	16.02202381	15.87161661	NA	NA
3	1962	17.05439708	16.02202381	15.87161661	0.1504072
4	1963	16.79861751	17.05439708	16.02202381	1.032373273
5	1964	15.93225807	16.79861751	17.05439708	-0.25577957
6	1965	16.61933564	15.93225807	16.79861751	-0.866359447
7	1966	16.59719662	16.61933564	15.93225807	0.68707757
8	1967	15.76121352	16.59719662	16.61933564	-0.022139017
9	1968	16.80385613	15.76121352	16.59719662	-0.835983103
10	1969	15.99168587	16.80385613	15.76121352	1.042642617
11	1970	17.10533794	15.99168587	16.80385613	-0.812170267
12	1971	17.48895929	17.10533794	15.99168587	1.113652073
13	1972	16.21889136	17.48895929	17.10533794	0.383621353
14	1973	16.53400538	16.21889136	17.48895929	-1.27006793
15	1974	15.98220046	16.53400538	16.21889136	0.315114013
16	1975	17.98306452	15.98220046	16.53400538	-0.551804913
17	1976	15.08644791	17.98306452	15.98220046	2.000864053
18	1977	15.55499232	15.08644791	17.98306452	-2.89661661
19	1978	17.15228495	15.55499232	15.08644791	0.468544413
20	1979	16.71952765	17.15228495	15.55499232	1.597292627
21	1980	15.85708194	16.71952765	17.15228495	-0.432757297
22	1981	17.53673195	15.85708194	16.71952765	-0.86244571
23	1982	17.00130568	17.53673195	15.85708194	1.67965001
24	1983	15.67517281	17.00130568	17.53673195	-0.535426267
25	1984	16.06023359	15.67517281	17.00130568	-1.326132873
26	1985	17.17937788	16.06023359	15.67517281	0.385060783
27	1986	17.58938172	17.17937788	16.06023359	1.11914429
28	1987	16.4297235	17.58938172	17.17937788	0.410003837
29	1988	16.45192807	16.4297235	17.58938172	-1.15965822
30	1989	17.22592166	16.45192807	16.4297235	0.022204567
31	1990	17.64759984	17.22592166	16.45192807	0.773993593
32	1991	16.34153226	17.64759984	17.22592166	0.421678183
33	1992	15.72237671	16.34153226	17.64759984	-1.306067587
34	1993	14.98621352	15.72237671	16.34153226	-0.619155543
35	1994	16.67864823	14.98621352	15.72237671	-0.736163197
36	1995	16.58734639	16.67864823	14.98621352	1.692434717
37	1996	16.60328142	16.58734639	16.67864823	-0.091301843
38	1997	15.91436252	16.60328142	16.58734639	0.015935033
39	1998	17.90167051	15.91436252	16.60328142	-0.688918903
40	1999	18.16514977	17.90167051	15.91436252	1.987307987
41	2000	15.88036708	18.16514977	17.90167051	0.263479263
42	2001	16.79857911	15.88036708	18.16514977	-2.284782693
43	2002	16.3655914	16.79857911	15.88036708	0.918212033
44	2003	16.83185484	16.3655914	16.79857911	-0.43298771
45	2004	15.83001483	16.83185484	16.3655914	0.46626344
46	2005	17.0593702	15.83001483	16.83185484	-1.001840007
47	2006	16.16452881	17.0593702	15.83001483	1.22935537
48	2007	16.13525667	16.16452881	17.0593702	-0.89484139
49	2008	17.40463627	16.13525667	16.16452881	-0.029272147
50	2009	16.39232679	17.40463627	16.13525667	1.269379603
51	2010	16.29059584	16.39232679	17.40463627	-1.012309477
52	2011	16.68720078	16.29059584	16.39232679	-0.101730953