Year	Percent
1989	6.29598
1990	6.46088
1991	5.20265
1992	4.9176
1993	3.95392
1994	4.5959
1995	4.88826
1996	6.21331
1997	7.53626
1998	9.41068
1999	13.17285
2000	18.72726
2001	19.24616
2002	16.5203
2003	11.956
2004	11.59272
2005	12.84315
2006	12.07642
2007	11.86594
2008	11.64694
2009	13.19728
2010	11.22417
2011	9.72019
2012	10.4927
2013	9.65062
2014	10.61499
2015	12.30504
2016	13.44871