Year	Number
1971	491902
1972	377271
1973	366333
1974	331104
1975	291792
1976	252295
1977	343856
1978	383025
1979	321870
1980	246743
1981	189362
1982	90651
1983	12827
1984	42837
1985	46336
1986	115441
1987	145689
1988	221400
1989	209735
1990	149583
1991	114009
1992	31893
1993	1206
1994	6585
1995	5558
1996	5551
1997	36160
1998	12590
1999	9865
2000	98027
2001	92431
2002	85209
2003	50430
2004	59631
2005	28666
2006	22143
2007	9081
2008	5909
2009	43186
2010	1882
2011	30663
2012	36021
2013	65766
2014	81037
2015	4439
2016	19406
2017	51373
2018	51348
2019	25087
2020	37706
2021	39299
2022	29036