Year	Percent
1990	14.47
1991	13.92
1992	13.77
1993	13.69
1994	12.974
1995	12.29
1996	12.36
1997	14.75
1998	13.04
1999	11.64
2000	13.02
2001	12.006
2002	11.06
2003	12.12
2004	11.74
2005	12.11
2006	12.93
2007	12.66
2008	11.48
2009	10.946
2010	10.433
2011	9.942
2012	9.472
2013	9.022
2014	8.591
2015	8.178
2016	8.209
2017	8.062
2018	7.915
2019	7.768
2020	7.621
2021	7.475
2022	7.328
2023	7.181
2024	7.034
2025	6.887
2026	6.74
2027	6.593
2028	6.446
2029	6.299
2030	6.152