Year	Number
1978	14064
1980	20741
1981	27217
1982	21700
1983	28723
1984	32924
1985	39014
1986	44032
1987	32535
1988	30375
1989	23465
1990	16053
1991	13283
1992	18186
1993	24837
1994	27707
1995	24759
1996	31646
1997	38826
1998	25982
2002	17624
2003	17752
2004	22609
2005	22492
2006	22242
2007	25744
2009	46601
2010	39230
2011	30768
2012	12712
2013	6081
2017	5876
2019	9582
2020	4009