Year	Percent
1990	48.664
1991	49.018
1992	50.771
1993	51.261
1994	52.484
1995	53.678
1996	61.628
1997	61.219
1998	61.005
1999	61.572
2000	62.069
2001	63.161
2002	62.053
2003	59.66
2004	60.89
2005	62.74
2006	64.569
2007	68.288
2008	69.547
2009	70.864
2010	70.799
2011	71.718
2012	71.216
2013	72.081
2014	72.875
2015	73.067
2016	72.918
2017	73.401
2018	73.868
2019	74.281
2020	74.614
2021	74.79
2022	74.872
2023	74.893
2024	74.904
2025	74.934
2026	74.896
2027	74.865
2028	74.84
2029	74.81
2030	74.773