Year	Percent
1975	2.69224
1976	2.95113
1977	8.16105
1978	9.92987
1979	8.77632
1980	9.21539
1981	13.46471
1982	16.49118
1983	29.21268
1984	23.847
1985	33.14749
1986	42.69898
1987	39.00543
1988	48.84403
1989	55.49208
1990	35.64331
1991	35.89821
1992	27.85438
1993	47.87318
1994	52.75124
1995	65.3471
1996	83.43596
1997	100.08787
1998	104.46279
1999	137.81816
2000	126.38048
2001	98.58162
2002	67.86646
2003	87.54737