Year	Percent
1984	6.49
1990	3.13
1991	3.46
1992	3.35
1993	3.01
1994	3.37
1995	4.29
1998	4.4
2000	6.66
2001	7.03
2003	9.03
2004	6.2472
2005	6.1274
2006	4.9131
2007	3.6472
2008	3.0827
2009	3.1399
2010	2.84
2011	2.788
2012	3.0628
2013	2.8761
2014	3.0721
2015	3.9057
2016	4.076
2017	4.2698