Year	Percent
1991	44.496
1992	45.018
1993	48.332
1994	49.563
1995	50.55
1996	48.997
1997	49.446
1998	46.631
1999	48.335
2000	49.85
2001	49.85
2002	49.848
2003	50.639
2004	51.112
2005	51.382
2006	51.644
2007	51.564
2008	52.409
2009	52.579
2010	53.35
2011	52.966
2012	53.895
2013	54.292
2014	53.524
2015	53.295
2016	53.191
2017	53.438
2018	53.876
2019	54.147
2020	54.442
2021	54.733
2022	55.024