Year	Percent
1990	7.7
1991	8.39
1992	7.94
1993	8.58
1994	9.25
1995	9.27
1996	9.92
1997	10.77
1998	12.81
1999	12.59
2000	12.87
2001	13.59
2002	14.15
2003	13.84
2004	12.38
2005	13.19
2006	13.17
2007	13.86
2008	13.42
2009	13.26
2010	12.54
2011	9.18
2012	9.56
2013	8.34
2014	7.44
2015	7.23
2016	6.72
2017	6.507
2018	6.294
2019	6.08
2020	5.867
2021	5.654
2022	5.441
2023	5.228
2024	5.015
2025	4.801
2026	4.588
2027	4.375
2028	4.162
2029	3.949
2030	3.736