Year	Number of
1980	24
1981	26
1982	13
1983	24
1984	15
1985	11
1986	14
1987	14
1988	12
1989	16
1990	13
1991	26
1992	30
1993	26
1994	25
1995	11
1996	28
1997	11
1998	16
1999	22
2000	16
2001	16
2002	24
2003	7
2004	18
2005	22
2006	30
2007	38
2008	48
2009	42
2010	29
2011	30
2012	42
2013	50
2014	45
2015	32
2016	50
2017	42
2018	55
2019	98
2020	140