Year	Percent
1991	7.607
1992	7.777
1993	7.381
1994	7.277
1995	7.178
1996	7.047
1997	6.369
1998	5.949
1999	6.984
2000	8.062
2001	7.45
2002	6.525
2003	7.03
2004	7.541
2005	6.482
2006	6.262
2007	5.393
2008	4.743
2009	4.849
2010	4.559
2011	4.422
2012	4.23
2013	3.938
2014	4.251
2015	4.177
2016	4.682
2017	4.658
2018	4.659
2019	4.66
2020	4.66
2021	4.661
2022	4.661