Year	Percent
1991	4.479
1992	4.397
1993	4.873
1994	4.659
1995	4.907
1996	5.038
1997	5.227
1998	4.888
1999	4.73
2000	4.942
2001	5.586
2002	6.5
2003	5.564
2004	3.507
2005	3.396
2006	3.671
2007	3.635
2008	3.566
2009	4.044
2010	4.069
2011	4.073
2012	4.011
2013	4.243
2014	4.627
2015	4.237
2016	2.92
2017	3.076
2018	3.101
2019	3.099
2020	3.106
2021	3.109
2022	3.111