Year	Percent
1975	35.49184
1976	29.96227
1977	43.89183
1978	38.53361
1979	6.85562
1980	6.36797
1981	35.05457
1982	38.10341
1983	46.12513
1984	51.22643
1985	72.24322
1986	78.6257
1987	91.21655
1988	78.17925
1989	87.85565
1990	77.74165
1991	86.62236
1992	80.94561
1993	108.37532
1994	100.24902
1995	99.60439
1996	121.46865
1997	133.22177
1998	140.22798
1999	177.39994
2000	156.37546
2001	132.56167
2002	104.96413
2003	119.00647
2004	117.401
2005	121.32266
2006	140.43455
2007	125.11424
2008	64.62935