Year	Percent
1990	10.659
1991	10.325
1992	9.968
1993	9.829
1994	9.875
1995	10.057
1996	10.104
1997	10.203
1998	10.282
1999	10.351
2000	10.359
2001	10.423
2002	10.537
2003	10.713
2004	10.978
2005	11.141
2006	11.328
2007	11.542
2008	11.71
2009	8.94
2010	8.75
2011	8.91
2012	7.869
2013	6.94
2014	8.42
2015	7.23
2016	7.14
2017	6.968
2018	6.797
2019	6.625
2020	6.453
2021	6.282
2022	6.11
2023	5.938
2024	5.767
2025	5.595
2026	5.423
2027	5.252
2028	5.08
2029	4.908
2030	4.737