Year	years
1970	9
1971	9
1972	9
1973	9
1974	9
1975	9
1976	9
1977	9
1978	9
1979	9
1980	9
1981	9
1982	9
1983	9
1984	9
1985	9
1986	9
1987	9
1988	9
1989	9
1990	9
1991	9
1992	9
1993	9
1994	9
1995	9
1996	9
1997	9
1998	9
1999	9
2000	9
2001	9
2002	9
2003	9
2004	9
2005	9
2006	9
2007	9
2008	9
2009	9
2010	9
2011	9
2012	9
2013	9
2014	9
2015	9
2016	9
2017	9
2018	9
2019	9
2020	9
2021	9
2022	9
2023	9