Year	Percent
1990	11.311
1991	11.339
1992	11.285
1993	11.309
1994	11.094
1995	10.867
1996	10.489
1997	9.951
1998	9.49
1999	9.74
2000	10.11
2001	8.83
2002	7.92
2003	10
2004	6.52
2005	6.43
2006	6.98
2007	9.17
2008	9.59
2009	7.85
2010	6.74
2011	7.51
2012	8.22
2013	8.73
2014	8.52
2015	9.29
2016	10.88
2017	10.78
2018	10.68
2019	10.58
2020	10.48
2021	10.38
2022	10.28
2023	10.18
2024	10.08
2025	9.98
2026	9.88
2027	9.78
2028	9.68
2029	9.58
2030	9.48