Year	Percent
1991	47.599
1992	60.18
1993	68.375
1994	68.895
1995	67.717
1996	68.13
1997	59.36
1998	67.26
1999	68.424
2000	65.17
2001	65.501
2002	63.35
2003	63.308
2004	63.053
2005	62.268
2006	61.828
2007	61.305
2008	54.108
2009	53.399
2010	51.509
2011	57.892
2012	59.938
2013	57.087
2014	57.892
2015	60.151
2016	60.478
2017	60.646
2018	60.628
2019	60.634
2020	60.661
2021	60.647
2022	60.648