Year	Percent
1990	53.365
1991	53.763
1992	54.786
1993	55.538
1994	55.936
1995	56.585
1996	57.352
1997	58.219
1998	59.032
1999	59.789
2000	60.419
2001	60.844
2002	61.447
2003	61.597
2004	61.875
2005	62.713
2006	63.624
2007	64.464
2008	63.091
2009	61.688
2010	63.344
2011	65.952
2012	66.457
2013	68.145
2014	68.968
2015	69.762
2016	70.395
2017	70.596
2018	70.797
2019	70.999
2020	71.202
2021	71.409
2022	71.616
2023	71.822
2024	72.026
2025	72.228
2026	72.431
2027	72.632
2028	72.83
2029	73.028
2030	73.227