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	12
1991	10
1992	10
1993	10
1994	10
1995	10
1996	10
1997	10
1998	10
1999	10
2000	10
2001	10
2002	10
2003	10
2004	10
2005	10
2006	10
2007	10
2008	10
2009	10
2010	10
2011	10
2012	10
2013	10
2014	10
2015	10
2016	10
2017	10
2018	10
2019	10
2020	10
2021	10
2022	10
2023	10