Year	Percent
1991	86.903
1992	87.536
1993	89.121
1994	89.231
1995	89.126
1996	88.524
1997	88.954
1998	89.724
1999	89.347
2000	89.321
2001	90.512
2002	90.24
2003	89.287
2004	88.911
2005	86.736
2006	86.163
2007	86.165
2008	86.136
2009	85.898
2010	85.531
2011	84.925
2012	84.538
2013	83.682
2014	82.952
2015	83.684
2016	84.554
2017	84.544
2018	84.497
2019	84.451
2020	84.396
2021	84.342
2022	84.288