Year	Percent
1993	4.28617
1994	12.79391
1995	15.3669
1996	21.27034
1997	17.50563
1998	15.68767
1999	16.31469
2000	15.80899
2001	12.06999
2002	12.52139
2003	15.56577
2004	22.56703
2005	25.59894
2006	28.54177
2007	36.41826
2008	17.35644