Year	Percent
1990	53.544
1991	53.827
1992	54.226
1993	54.473
1994	54.849
1995	55.115
1996	55.284
1997	55.544
1998	55.684
1999	55.772
2000	55.905
2001	56.029
2002	56.162
2003	56.259
2004	56.309
2005	56.292
2006	56.257
2007	56.182
2008	56.099
2009	56.069
2010	56.099
2011	56.18
2012	56.318
2013	56.477
2014	56.614
2015	56.718
2016	56.797
2017	56.829
2018	56.83
2019	56.83
2020	56.844
2021	56.874
2022	56.917
2023	56.949
2024	56.937
2025	56.861
2026	56.736
2027	56.555
2028	56.348
2029	56.159
2030	56.013