Year	Percent
1990	10.288
1991	10.26
1992	10.176
1993	10.068
1994	9.984
1995	9.933
1996	9.873
1997	9.85
1998	9.85
1999	9.84
2000	9.805
2001	9.793
2002	9.753
2003	9.718
2004	9.689
2005	9.688
2006	9.7
2007	9.702
2008	9.724
2009	9.73
2010	9.745
2011	9.732
2012	9.721
2013	9.713
2014	9.699
2015	9.668
2016	9.63
2017	9.628
2018	9.626
2019	9.625
2020	9.623
2021	9.622
2022	9.62
2023	9.619
2024	9.617
2025	9.615
2026	9.614
2027	9.612
2028	9.611
2029	9.609
2030	9.608