Year	Percent
1990	62.141
1991	62.061
1992	62.137
1993	61.718
1994	61.16
1995	59.955
1996	59.38
1997	58.125
1998	58.004
1999	57.866
2000	59.285
2001	59.975
2002	58.682
2003	58.256
2004	57.549
2005	57.959
2006	56.747
2007	56.43
2008	56.883
2009	57.716
2010	58.9
2011	59.229
2012	60.046
2013	60.451
2014	61.399
2015	61.711
2016	62.244
2017	62.502
2018	62.767
2019	63.027
2020	63.275
2021	63.52
2022	63.749
2023	63.96
2024	64.146
2025	64.305
2026	64.443
2027	64.552
2028	64.634
2029	64.689
2030	64.721