Year	Percent
1991	1.842
1992	2.714
1993	3.983
1994	3.488
1995	3.9187
1996	2.4467
1997	2.6367
1998	1.3379
1999	1.1346
2000	0.5455
2001	0.8578
2002	2.2193
2003	2.0272
2004	2.2446
2005	1.6015
2006	1.5549
2007	1.1418
2008	2.123
2009	7.1658
2010	6.9726
2011	5.604
2012	4.6878
2013	4.3667
2014	3.7276
2015	2.5869
2016	2.2258
2017	1.7318