Year	Percent
1990	65.724
1991	65.451
1992	65.769
1993	66.444
1994	67.809
1995	67.637
1996	67.159
1997	67.364
1998	68.287
1999	69.656
2000	70.112
2001	70.638
2002	71.718
2003	72.211
2004	71.789
2005	72.12
2006	72.726
2007	72.95
2008	72.986
2009	73.285
2010	74.152
2011	72.687
2012	73.137
2013	73.503
2014	74.293
2015	74.994
2016	75.614
2017	75.773
2018	75.935
2019	76.099
2020	76.26
2021	76.419
2022	76.576
2023	76.734
2024	76.897
2025	77.066
2026	77.238
2027	77.417
2028	77.599
2029	77.781
2030	77.961