Year	Percent
1990	47.301
1991	47.778
1992	48.426
1993	49.084
1994	49.713
1995	50.285
1996	50.844
1997	51.35
1998	51.828
1999	52.305
2000	52.808
2001	53.37
2002	54.112
2003	55.235
2004	56.577
2005	57.332
2006	58.332
2007	58.655
2008	59.066
2009	59.068
2010	58.898
2011	59.256
2012	59.517
2013	59.862
2014	60.203
2015	60.621
2016	60.901
2017	61.161
2018	61.402
2019	61.595
2020	61.742
2021	61.907
2022	62.026
2023	62.082
2024	62.069
2025	61.972
2026	61.88
2027	61.712
2028	61.477
2029	61.199
2030	60.903