Year	Percent
1990	12.25
1991	12.59
1992	12.964
1993	13.459
1994	13.453
1995	13.395
1996	13.183
1997	13.114
1998	13.12
1999	12.955
2000	12.797
2001	12.716
2002	12.684
2003	12.585
2004	12.433
2005	11.983
2006	11.547
2007	11.125
2008	10.4
2009	11.347
2010	10.632
2011	10.568
2012	10.5
2013	10.439
2014	10.418
2015	10.317
2016	10.292
2017	10.125
2018	9.957
2019	9.789
2020	9.621
2021	9.453
2022	9.285
2023	9.117
2024	8.949
2025	8.781
2026	8.613
2027	8.445
2028	8.277
2029	8.109
2030	7.941