Year	Percent
1991	53.317
1992	54.24
1993	57.53
1994	59.359
1995	58.401
1996	62.465
1997	58.06
1998	60.564
1999	60.01
2000	62.134
2001	64.029
2002	63.056
2003	63.681
2004	63.186
2005	64.329
2006	65.872
2007	65.869
2008	65.588
2009	67.84
2010	70.728
2011	71.284
2012	70.627
2013	71.727
2014	72.226
2015	72.931
2016	73.384
2017	74.7
2018	75.217
2019	75.659
2020	76.089
2021	76.504
2022	76.919