Year	Number
1965	5000
1966	6290
1967	10710
1968	13190
1969	12640
1970	16000
1971	17000
1972	25000
1973	37310
1974	40430
1975	36050
1976	34070
1977	64900
1978	79140
1979	57790
1980	36410
1981	40560
1982	89110
1983	103000
1984	96480
1985	103780
1986	138270
1987	144100
1988	143568
1989	137180
1990	138049
1991	140676
1992	142104
1993	141126
1994	141126
1995	129965
1996	131139
1997	165072
1998	168564
1999	206386
2000	250940
2001	284173
2002	246765
2003	226697
2004	173907
2005	155718
2006	120253
2007	112931
2008	83484
2009	56786
2010	47853
2011	45627
2012	25647
2013	23584
2014	25566
2015	26434
2016	29338
2017	41266
2018	49877
2019	57518
2020	66070
2021	75154
2022	61159
2023	72411