Year	Percent
1990	61.029
1991	61.479
1992	61.996
1993	62.577
1994	63.203
1995	62.953
1996	62.27
1997	61.682
1998	61.477
1999	61.302
2000	57.309
2001	60.541
2002	58.535
2003	60.308
2004	59.045
2005	58.409
2006	58.446
2007	58.517
2008	58.622
2009	58.767
2010	61.423
2011	62.31
2012	62.697
2013	62.293
2014	62.65
2015	64.389
2016	62.803
2017	63.19
2018	63.546
2019	63.844
2020	64.067
2021	64.232
2022	64.317
2023	64.335
2024	64.315
2025	64.279
2026	64.251
2027	64.219
2028	64.195
2029	64.199
2030	64.243