Year	Percent
1990	67.682
1991	71.478
1992	70.489
1993	72.524
1994	73.713
1995	74.583
1996	75.128
1997	75.701
1998	75.345
1999	75.77
2000	77.134
2001	78.109
2002	78.337
2003	79.899
2004	80.461
2005	81.692
2006	82.633
2007	82.725
2008	82.903
2009	83.278
2010	84.857
2011	84.506
2012	85.048
2013	85.561
2014	85.833
2015	86.056
2016	86.598
2017	86.811
2018	87.024
2019	87.231
2020	87.431
2021	87.627
2022	87.819
2023	88.013
2024	88.222
2025	88.451
2026	88.7
2027	88.969
2028	89.256
2029	89.554
2030	89.858