Year	years
1970	12
1971	12
1972	12
1973	12
1974	12
1975	12
1976	12
1977	12
1978	12
1979	12
1980	12
1981	12
1982	12
1983	12
1984	12
1985	12
1986	12
1987	12
1988	12
1989	12
1990	11
1991	11
1992	11
1993	11
1994	11
1995	11
1996	11
1997	11
1998	11
1999	11
2000	11
2001	11
2002	11
2003	11
2004	11
2005	12
2006	12
2007	12
2008	12
2009	12
2010	12
2011	12
2012	12
2013	12
2014	12
2015	12
2016	12
2017	12
2018	12
2019	12
2020	12
2021	12
2022	12
2023	12