Year	Percent
1991	16.357
1992	19.643
1993	20.636
1994	21.76
1995	21.446
1996	21.43
1997	21.89
1998	21.789
1999	22.174
2000	21.591
2001	21.504
2002	21.036
2003	21.852
2004	22.415
2005	21.72
2006	23.204
2007	24.746
2008	25.433
2009	24.374
2010	23.904
2011	24.055
2012	23.874
2013	26.028
2014	26.128
2015	24.731
2016	23.689
2017	23.563
2018	23.524
2019	23.503
2020	23.488
2021	23.566
2022	23.635