Year	Percent
1990	68.846
1991	68.604
1992	69.789
1993	69.954
1994	68.955
1995	68.901
1996	70.276
1997	70.659
1998	71.971
1999	72.364
2000	71.769
2001	73.243
2002	73.803
2003	74.162
2004	73.996
2005	74.351
2006	74.806
2007	75.111
2008	76.721
2009	77.117
2010	75.242
2011	76.255
2012	76.718
2013	77.12
2014	78.112
2015	78.722
2016	79.545
2017	79.686
2018	79.812
2019	79.929
2020	80.044
2021	80.127
2022	80.199
2023	80.27
2024	80.353
2025	80.455
2026	80.551
2027	80.663
2028	80.796
2029	80.956
2030	81.143