Year	Number
1971	229745
1972	176757
1973	171502
1974	155362
1975	144793
1976	127924
1977	177204
1978	199048
1979	163570
1980	123019
1981	91248
1982	41655
1983	3005
1984	17256
1985	21556
1986	58789
1987	72545
1988	110331
1989	103449
1990	74086
1991	56618
1992	15131
1997	9461
2000	62037
2001	55035
2002	52198
2003	32299
2004	35801
2005	19505
2006	16145
2007	7655
2009	23944
2011	15256
2012	17643
2013	32742
2014	40484
2015	1956
2016	9913
2017	25692
2018	26049
2019	12418
2020	18502
2021	18877
2022	13453