Year	Percent
1990	51.389
1991	52.045
1992	52.697
1993	53.664
1994	54.578
1995	55.338
1996	55.806
1997	56.259
1998	55.699
1999	56.282
2000	56.79
2001	57.287
2002	56.212
2003	56.998
2004	57.575
2005	58.201
2006	59.003
2007	59.803
2008	62.481
2009	62.095
2010	63.378
2011	64.044
2012	65.017
2013	65.416
2014	66.861
2015	68.298
2016	68.452
2017	68.647
2018	68.853
2019	69.063
2020	69.274
2021	69.495
2022	69.718
2023	69.941
2024	70.166
2025	70.392
2026	70.63
2027	70.869
2028	71.105
2029	71.33
2030	71.543