Year	Percent
1990	60.762
1991	61.041
1992	60.738
1993	60.206
1994	60.839
1995	60.967
1996	60.743
1997	60.459
1998	60.419
1999	61.093
2000	61.364
2001	60.265
2002	60.037
2003	59.918
2004	60.01
2005	61.286
2006	60.794
2007	61.13
2008	60.841
2009	60.375
2010	60.791
2011	59.673
2012	59.721
2013	59.706
2014	59.381
2015	59.143
2016	58.964
2017	58.738
2018	58.511
2019	58.27
2020	58.007
2021	57.64
2022	57.253
2023	56.855
2024	56.465
2025	56.093
2026	55.715
2027	55.363
2028	55.038
2029	54.737
2030	54.458