Year	Percent
1990	7.896
1991	7.91
1992	7.94
1993	7.947
1994	7.973
1995	7.984
1996	7.981
1997	7.992
1998	7.988
1999	7.978
2000	7.977
2001	7.977
2002	7.981
2003	7.984
2004	7.985
2005	7.981
2006	7.978
2007	7.973
2008	7.967
2009	7.962
2010	7.957
2011	7.951
2012	7.944
2013	7.937
2014	7.929
2015	7.924
2016	7.92
2017	7.917
2018	7.914
2019	7.911
2020	7.908
2021	7.906
2022	7.903
2023	7.9
2024	7.897
2025	7.894
2026	7.891
2027	7.888
2028	7.886
2029	7.883
2030	7.88