Year	Percent
1990	11.239
1991	11.23
1992	11.137
1993	11.045
1994	10.953
1995	10.862
1996	10.772
1997	10.682
1998	10.593
1999	10.505
2000	10.417
2001	10.33
2002	10.026
2003	9.877
2004	9.829
2005	9.481
2006	9.653
2007	9.584
2008	9.694
2009	9.687
2010	9.682
2011	9.557
2012	9.4
2013	9.317
2014	9.26
2015	9.289
2016	9.336
2017	9.288
2018	9.239
2019	9.191
2020	9.142
2021	9.094
2022	9.045
2023	8.997
2024	8.948
2025	8.9
2026	8.851
2027	8.803
2028	8.754
2029	8.706
2030	8.657