Year	Number
1971	262157
1972	200514
1973	194831
1974	175742
1975	146999
1976	124371
1977	166652
1978	183977
1979	158300
1980	123724
1981	98114
1982	48996
1983	9822
1984	25581
1985	24780
1986	56652
1987	73144
1988	111069
1989	106286
1990	75497
1991	57391
1992	16762
1997	26699
2000	35990
2001	37396
2002	33011
2003	18131
2004	23830
2005	9161
2006	5998
2007	1426
2009	19242
2011	15407
2012	18378
2013	33024
2014	40553
2015	2483
2016	9493
2017	25681
2018	25299
2019	12669
2020	19204
2021	20422
2022	15583