Year	Percent
1990	53.32
1991	53.8
1992	55.127
1993	56.44
1994	57.731
1995	60.104
1996	63.067
1997	65.986
1998	65.298
1999	68.425
2000	65.61
2001	71.434
2002	72.911
2003	74.341
2004	75.725
2005	77.061
2006	78.347
2007	79.583
2008	79.163
2009	79.75
2010	80.882
2011	80.838
2012	80.61
2013	80.537
2014	79.006
2015	77.908
2016	78.419
2017	78.85
2018	79.284
2019	79.72
2020	80.159
2021	80.6
2022	81.043
2023	81.488
2024	81.931
2025	82.374
2026	82.815
2027	83.254
2028	83.694
2029	84.133
2030	84.573