Year	Percent
1990	1.856
1991	3.512
1992	6.731
1993	10.863
1994	10.882
1995	9.8374
1996	10.4322
1997	10.9657
1998	9.7402
1999	8.2813
2000	5.8908
2001	5.0333
2002	5.278
2003	6.0536
2004	7.1578
2005	7.5874
2006	6.8952
2007	5.8847
2008	5.9366
2009	8.6567
2010	8.6884
2011	7.8409
2012	8.2144
2013	8.2007
2014	8.1881
2015	7.5603
2016	7.3573
2017	6.9694