Year	Percent
1995	4.041
1996	3.265
1997	4.948
1998	3.698
1999	5.732
2000	4.084
2001	5.185
2002	5.858
2003	21.18
2004	21.83
2005	29.97
2006	31.06
2007	36.18
2008	47.11
2009	44.71
2010	42.52