Year	Percent
1991	26.684
1992	26.399
1993	25.34
1994	24.875
1995	23.926
1996	23.942
1997	23.15
1998	20.459
1999	19.792
2000	19.651
2001	17.411
2002	16.956
2003	16.573
2004	13.882
2005	13.527
2006	12.867
2007	12.126
2008	11.612
2009	11.854
2010	12.583
2011	12.636
2012	12.945
2013	13.446
2014	12.981
2015	12.352
2016	11.743
2017	11.484
2018	11.238
2019	11.029
2020	10.741
2021	10.429
2022	10.008