Year	Percent
1991	6.735
1992	5.59
1993	5.649
1994	6.177
1995	5.029
1996	4.536
1997	3.968
1998	3.406
1999	2.863
2000	2.905
2001	3.189
2002	2.051
2003	2.034
2004	2.019
2005	1.711
2006	1.994
2007	1.813
2008	1.837
2009	1.888
2010	1.74
2011	1.83
2012	1.793
2013	1.806
2014	1.834
2015	1.803
2016	1.844
2017	1.705
2018	1.656
2019	1.612
2020	1.597
2021	1.583
2022	1.567