Year	Percent
1990	6.994
1991	6.994
1992	6.994
1993	6.994
1994	6.994
1995	6.994
1996	6.994
1997	6.994
1998	6.994
1999	6.994
2000	6.994
2001	6.994
2002	6.994
2003	6.994
2004	7.19
2005	6.809
2006	6.431
2007	6.025
2008	5.645
2009	5.543
2010	5.282
2011	4.988
2012	4.71
2013	4.454
2014	4.246
2015	4.078
2016	3.875
2017	3.733
2018	3.59
2019	3.448
2020	3.306
2021	3.163
2022	3.021
2023	2.879
2024	2.736
2025	2.594
2026	2.452
2027	2.309
2028	2.167
2029	2.024
2030	1.882