Year	Percent
1990	53.432
1991	54.399
1992	53.356
1993	52.808
1994	53.443
1995	54.362
1996	54.658
1997	55.041
1998	55.736
1999	56.518
2000	57.32
2001	58.234
2002	59.839
2003	59.701
2004	60.045
2005	60.265
2006	60.633
2007	61.131
2008	61.06
2009	61.205
2010	59.852
2011	61.16
2012	62.277
2013	63.453
2014	63.926
2015	64.502
2016	64.546
2017	64.76
2018	65.001
2019	65.241
2020	65.453
2021	65.505
2022	65.5
2023	65.469
2024	65.464
2025	65.517
2026	65.558
2027	65.65
2028	65.769
2029	65.867
2030	65.914