Year	Percent
1992	5.166
1993	4.626
1994	3.922
1995	3.628
1996	3.37
1997	3.281
1998	3.025
1999	3.109
2000	3.265
2001	3.35
2002	3.41
2003	3.517
2004	3.582
2005	3.636
2006	3.733
2007	3.843
2008	3.93
2009	3.638
2010	3.611
2011	3.644
2012	3.663
2013	3.607
2014	3.51
2015	3.312
2016	3.217
2017	3.153
2018	3.117
2019	3.068
2020	3.013
2021	2.957
2022	2.9
2023	2.846
2024	2.792