Year	Percent
1989	2.85082
1990	3.28633
1991	1.52979
1992	1.44769
1993	1.06552
1994	1.61873
1995	1.28868
1996	1.23694
1997	1.20567
1998	1.80613
1999	3.54543
2000	5.87019
2001	6.14252
2002	3.80074
2003	3.96818
2004	3.72475
2005	3.84222
2006	4.82749
2007	3.4798
2008	6.6874
2009	9.10876
2010	10.94678
2011	10.18359
2012	6.37508
2013	5.71952
2014	6.44906
2015	7.50169
2016	8.49988