Year	Percent
1991	44.226
1992	37.084
1993	45.433
1994	45.631
1995	48.292
1996	74.324
1997	51.415
1998	55.571
1999	56.919
2000	53.711
2001	57.977
2002	62.098
2003	54.818
2004	47.452
2005	48.43
2006	50.676
2007	47.287
2008	48.803
2009	48.811
2010	50.909
2011	51.545
2012	56.954
2013	52.086
2014	51.771
2015	54.186
2016	55.44
2017	56.511
2018	56.909
2019	57.536
2020	58.282
2021	58.983
2022	59.561