Year	Percent
1988	5.84
1990	5.66
1995	7.58
1997	7.87
1998	8.77
2000	11.12
2002	12
2004	10.98
2006	1.0206
2007	0.8976
2008	0.911
2009	1.1928
2010	1.3365
2011	1.8149
2013	6.0453
2014	4.0299
2015	5.6514