Year	Percent
1991	96.171
1992	96.111
1993	95.617
1994	95.146
1995	94.551
1996	94.725
1997	88.837
1998	88.51
1999	88.399
2000	87.921
2001	86.382
2002	90.349
2003	89.584
2004	89.307
2005	88.435
2006	87.298
2007	86.596
2008	85.955
2009	62.642
2010	62.264
2011	60.946
2012	60.116
2013	59.564
2014	59.456
2015	58.567
2016	57.743
2017	57.676
2018	57.57
2019	57.463
2020	57.356
2021	57.247
2022	57.138