Year	Percent
1990	48.7
1991	49.374
1992	50.441
1993	51.325
1994	51.741
1995	52.858
1996	53.518
1997	54.324
1998	55.133
1999	55.767
2000	56.267
2001	56.999
2002	58.035
2003	59.126
2004	59.938
2005	60.595
2006	61.548
2007	62.093
2008	62.592
2009	62.762
2010	62.852
2011	63.068
2012	63.421
2013	63.79
2014	64.044
2015	64.242
2016	64.562
2017	64.865
2018	65.157
2019	65.418
2020	65.63
2021	65.845
2022	66.014
2023	66.161
2024	66.333
2025	66.552
2026	66.865
2027	67.235
2028	67.633
2029	68.007
2030	68.335