Year	Percent
1990	50.492
1991	50.69
1992	50.907
1993	51.076
1994	51.295
1995	50.596
1996	49.923
1997	49.325
1998	49.648
1999	49.98
2000	50.304
2001	51.015
2002	51.673
2003	52.284
2004	52.859
2005	53.406
2006	53.956
2007	54.475
2008	54.979
2009	55.494
2010	56.036
2011	56.721
2012	57.443
2013	58.196
2014	58.972
2015	59.329
2016	59.64
2017	60.164
2018	60.691
2019	61.207
2020	61.702
2021	62.173
2022	62.625
2023	63.046
2024	63.419
2025	63.739
2026	64.009
2027	64.227
2028	64.42
2029	64.625
2030	64.867