rownames,time,value
1,1971.25,13067.3
2,1971.5,13130.5
3,1971.75,13198.4
4,1972,13254.2
5,1972.25,13303.7
6,1972.5,13353.9
7,1972.75,13409.3
8,1973,13459.2
9,1973.25,13504.5
10,1973.5,13552.6
11,1973.75,13614.3
12,1974,13669.5
13,1974.25,13722.6
14,1974.5,13772.1
15,1974.75,13832
16,1975,13862.6
17,1975.25,13893
18,1975.5,13926.8
19,1975.75,13968.9
20,1976,14004.7
21,1976.25,14033.1
22,1976.5,14066
23,1976.75,14110.1
24,1977,14155.6
25,1977.25,14192.2
26,1977.5,14231.7
27,1977.75,14281.5
28,1978,14330.3
29,1978.25,14359.3
30,1978.5,14396.6
31,1978.75,14430.8
32,1979,14478.4
33,1979.25,14515.7
34,1979.5,14554.9
35,1979.75,14602.5
36,1980,14646.4
37,1980.25,14695.4
38,1980.5,14746.6
39,1980.75,14807.4
40,1981,14874.4
41,1981.25,14923.3
42,1981.5,14988.7
43,1981.75,15054.1
44,1982,15121.7
45,1982.25,15184.2
46,1982.5,15239.3
47,1982.75,15288.9
48,1983,15346.2
49,1983.25,15393.5
50,1983.5,15439
51,1983.75,15483.5
52,1984,15531.5
53,1984.25,15579.4
54,1984.5,15628.5
55,1984.75,15677.3
56,1985,15736.7
57,1985.25,15788.3
58,1985.5,15839.7
59,1985.75,15900.6
60,1986,15961.5
61,1986.25,16018.3
62,1986.5,16076.9
63,1986.75,16139
64,1987,16203
65,1987.25,16263.3
66,1987.5,16327.9
67,1987.75,16398.9
68,1988,16478.3
69,1988.25,16538.2
70,1988.5,16621.6
71,1988.75,16697
72,1989,16777.2
73,1989.25,16833.1
74,1989.5,16891.6
75,1989.75,16956.8
76,1990,17026.3
77,1990.25,17085.4
78,1990.5,17106.9
79,1990.75,17169.4
80,1991,17239.4
81,1991.25,17292
82,1991.5,17354.2
83,1991.75,17414.2
84,1992,17447.3
85,1992.25,17482.6
86,1992.5,17526
87,1992.75,17568.7
88,1993,17627.1
89,1993.25,17661.5