Year	Percent
1991	5.289
1992	5.19
1993	4.853
1994	5.135
1995	5.347
1996	5.384
1997	5.652
1998	5.598
1999	5.602
2000	5.041
2001	5.041
2002	3.714
2003	3.804
2004	3.782
2005	3.868
2006	3.877
2007	3.855
2008	3.863
2009	3.995
2010	3.92
2011	4.156
2012	4.59
2013	4.754
2014	4.966
2015	4.941
2016	4.824
2017	4.744
2018	4.716
2019	4.677
2020	4.637
2021	4.607
2022	4.578