Year	Percent
1990	49.799
1991	49.8
1992	49.733
1993	49.667
1994	49.6
1995	51.5
1996	54.618
1997	57.7
1998	55.1
1999	56.3
2000	64.9
2001	61
2002	60.461
2003	59.919
2004	59.375
2005	58.829
2006	58.281
2007	57.73
2008	61.89
2009	61.07
2010	61.62
2011	60.04
2012	61.03
2013	58.7
2014	58.48
2015	60.56
2016	60.592
2017	60.624
2018	60.655
2019	60.686
2020	60.718
2021	60.749
2022	60.781
2023	60.812
2024	60.843
2025	60.875
2026	60.906
2027	60.938
2028	60.969
2029	61
2030	61.032