Year	Percent
1990	49.746
1991	49.776
1992	49.663
1993	49.803
1994	50.655
1995	51.352
1996	52.07
1997	53.152
1998	50.513
1999	50.994
2000	52.123
2001	52.75
2002	53.452
2003	52.949
2004	54.156
2005	54.609
2006	54.95
2007	54.896
2008	54.72
2009	53.86
2010	54.417
2011	54.787
2012	55.11
2013	55.526
2014	56.97
2015	57.87
2016	58.416
2017	58.603
2018	58.806
2019	58.999
2020	59.163
2021	59.298
2022	59.409
2023	59.497
2024	59.563
2025	59.602
2026	59.603
2027	59.563
2028	59.494
2029	59.417
2030	59.348