Year	Percent
1992	7.81086
1993	16.99501
1994	25.1374
1995	22.5367
1996	27.58926
1997	31.28073
1998	32.28686
1999	45.51418
2000	21.99676
2001	35.26062
2002	29.54893
2003	26.54396
2004	20.26292
2005	20.33944
2006	13.68112
2007	12.67358
2008	12.71354
2009	9.2638
2010	9.29921
2011	9.99845