Year	Percent
1990	46.23
1991	48.188
1992	49.293
1993	50.269
1994	51.232
1995	51.826
1996	52.087
1997	52.867
1998	53.763
1999	55.898
2000	56.502
2001	54.315
2002	55.209
2003	55.568
2004	57.431
2005	59.267
2006	59.424
2007	60.426
2008	60.754
2009	60.822
2010	61.678
2011	60.892
2012	61.109
2013	62.114
2014	62.885
2015	62.996
2016	62.918
2017	63.154
2018	63.369
2019	63.572
2020	63.765
2021	63.926
2022	64.068
2023	64.205
2024	64.361
2025	64.55
2026	64.75
2027	64.983
2028	65.243
2029	65.519
2030	65.8