Year	Percent
1994	6.46664
1995	6.79486
1996	6.18308
1997	6.70515
1998	6.08819
1999	6.19685
2000	6.23751
2001	5.86312
2002	5.66293
2003	5.48637
2004	3.82091
2005	3.57964
2006	4.46973
2007	4.89277
2008	4.52189
2009	3.95087
2010	3.86196
2011	3.80461
2012	3.76453
2013	3.9554
2014	4.02281
2015	3.28466
2016	2.72715
2017	2.79291
2018	3.2319
2019	3.1691
2020	3.07825
2021	1.40017