Year	Percent
1990	10.524
1991	10.6
1992	10.662
1993	10.723
1994	10.77
1995	10.811
1996	10.84
1997	10.854
1998	10.817
1999	10.833
2000	10.853
2001	10.849
2002	10.857
2003	10.863
2004	10.865
2005	10.864
2006	10.86
2007	10.842
2008	10.836
2009	10.85
2010	10.833
2011	10.817
2012	10.798
2013	10.779
2014	10.749
2015	10.722
2016	10.7
2017	10.695
2018	10.691
2019	10.687
2020	10.682
2021	10.678
2022	10.674
2023	10.669
2024	10.665
2025	10.661
2026	10.656
2027	10.652
2028	10.648
2029	10.643
2030	10.639