Year	Percent
1990	4.316
1991	4.239
1992	4.205
1993	4.135
1994	4.01
1995	3.801
1996	3.754
1997	3.67
1998	3.583
1999	3.564
2000	3.5
2001	5.21
2002	5.08
2003	3.37
2004	3.15
2005	3.81
2006	3.82
2007	3.24
2008	3.13
2009	5.08
2010	6.86
2011	7.2
2012	7.37
2013	7.77
2014	9.62
2015	8.84
2016	7.49
2017	7.81
2018	8.13
2019	8.45
2020	8.769
2021	9.089
2022	9.409
2023	9.729
2024	10.049
2025	10.369
2026	10.689
2027	11.009
2028	11.328
2029	11.648
2030	11.968