Year	Percent
1975	26.06282
1976	28.38528
1981	66.4085
1982	77.74289
1983	84.98807
1984	115.20349
1986	70.76618
1987	68.92683
1988	63.89448
1989	47.06242
1991	63.56341
1992	54.64776
1993	57.50013
1994	55.21764
1997	59.07846
1998	48.62563
1999	58.63067
2000	50.19088
2001	55.76269
2002	59.48156
2004	56.26245
2005	51.89693
2006	68.12262
2007	77.57969
2009	98.79782
2010	88.595
2012	81.16261
2013	75.76988