Year	Percent
1990	18.819
1991	18.819
1992	18.819
1993	18.819
1994	18.819
1995	18.819
1996	18.819
1997	18.819
1998	18.819
1999	18.819
2000	18.819
2001	18.819
2002	18.819
2003	18.819
2004	18.819
2005	18.819
2006	18.819
2007	18.819
2008	17.95
2009	19.824
2010	19.523
2011	18.951
2012	18.143
2013	17.818
2014	17.469
2015	17.185
2016	17.192
2017	17.159
2018	17.127
2019	17.095
2020	17.062
2021	17.03
2022	16.998
2023	16.965
2024	16.933
2025	16.901
2026	16.869
2027	16.836
2028	16.804
2029	16.772
2030	16.739