Year	Percent
1987	5.25
1988	5.14
1989	5.76
1990	4.1
1991	5.18
1992	5.63
1993	5.85
1994	5.44
1995	5.38
1996	7.98
1997	6.92
1998	8.38
1999	10.26
2000	3.8433
2001	3.6181
2003	5.3574
2004	4.5309
2005	3.1777
2006	3.0159
2007	2.6348
2008	3.1985
2009	3.7706
2010	3.5202
2011	2.9255
2012	2.8518
2013	2.7047
2014	3.0566
2015	3.005
2016	3.7025
2017	3.0491