Year	Percent
1990	10.641
1991	11.178
1992	11.02
1993	10.75
1994	9.59
1995	8.5
1996	8.43
1997	8.01
1998	7.61
1999	6.05
2000	5.06
2001	4.77
2002	4.75
2003	4.08
2004	3.63
2005	3.72
2006	3.31
2007	3.22
2008	3.12
2009	3.01
2010	2.99
2011	3.06
2012	2.97
2013	2.97
2014	2.89
2015	2.72
2016	2.73
2017	2.635
2018	2.54
2019	2.445
2020	2.35
2021	2.255
2022	2.16
2023	2.066
2024	1.971
2025	1.876
2026	1.781
2027	1.686
2028	1.591
2029	1.496
2030	1.401