Year	Years
1962	1.067
1963	1.073
1964	1.995
1965	2.456
1966	2.105
1967	1.298
1968	-0.1316
1969	0.5645
1970	1.176
1971	3.521
1972	3.735
1973	3.707
1974	2.808
1975	2.45
1976	2.01
1977	3.019
1978	4.445
1979	4.484
1980	4.152
1981	4.161
1982	5.178
1983	5.33
1984	6.571
1985	6.778
1986	8.13
1987	8.661
1988	8.345
1989	7.543
1990	8.37
1991	8.399
1992	8.357
1993	8.48
1994	8.743
1995	9.065
1996	8.506
1997	8.612
1998	8.847
1999	9.441
2000	9.082
2001	9.063
2002	8.852
2003	8.836
2004	8.075