Year	Percent
1990	67.063
1991	67.086
1992	67.083
1993	67.079
1994	67.104
1995	67.105
1996	67.1
1997	61.2
1998	67.2
1999	67.25
2000	67.3
2001	67.35
2002	67.4
2003	70.3
2004	68.189
2005	66
2006	72.2
2007	66.71
2008	60.726
2009	54.401
2010	53.13
2011	52.14
2012	52.75
2013	51.23
2014	51.1
2015	54.51
2016	55.5
2017	54.94
2018	54.38
2019	53.821
2020	53.261
2021	52.701
2022	52.141
2023	51.581
2024	51.021
2025	50.462
2026	49.902
2027	49.342
2028	48.782
2029	48.222
2030	47.663