Year	Percent
1990	47.859
1991	47.451
1992	46.917
1993	46.072
1994	46.34
1995	46.701
1996	47.623
1997	48.07
1998	48.289
1999	48.963
2000	49.731
2001	50.313
2002	50.931
2003	51.771
2004	52.676
2005	55.14
2006	57.603
2007	59.503
2008	60.542
2009	61.349
2010	61.199
2011	61.489
2012	61.774
2013	62.025
2014	62.146
2015	62.432
2016	62.424
2017	62.695
2018	62.977
2019	63.272
2020	63.58
2021	63.902
2022	64.237
2023	64.584
2024	64.944
2025	65.313
2026	65.693
2027	66.084
2028	66.474
2029	66.847
2030	67.191