Year	Percent
1990	7.55
1991	7.84
1992	6.9
1993	6.87
1994	6.48
1995	6.15
1996	6.18
1997	6.39
1998	5.64
1999	5.69
2000	5.64
2001	5.76
2002	6.16
2003	5.97
2004	6.39
2005	5.99
2006	6.17
2007	6.11
2008	6.28
2009	5.79
2010	5.69
2011	5.68
2012	6.15
2013	6.2
2014	6.49
2015	6.6
2016	6.75
2017	6.746
2018	6.743
2019	6.739
2020	6.736
2021	6.732
2022	6.729
2023	6.725
2024	6.721
2025	6.718
2026	6.714
2027	6.711
2028	6.707
2029	6.704
2030	6.7