Year	Percent
1990	62.924
1991	63.606
1992	65.288
1993	63.706
1994	66.457
1995	64.756
1996	65.238
1997	68.341
1998	68.036
1999	67.905
2000	68.817
2001	72.357
2002	74.979
2003	76.84
2004	77.333
2005	76.626
2006	77.619
2007	78.854
2008	79.216
2009	79.905
2010	81.124
2011	82.061
2012	82.035
2013	82.127
2014	84.043
2015	83.898
2016	83.994
2017	84.282
2018	84.56
2019	84.833
2020	85.109
2021	85.406
2022	85.705
2023	85.999
2024	86.282
2025	86.555
2026	86.838
2027	87.113
2028	87.385
2029	87.661
2030	87.946