Year	Number
1960	3916
1961	4081
1962	4108
1963	4037
1964	3922
1965	3866
1966	3789
1967	3629
1968	29767
1969	37673
1970	38490
1971	39031
1972	39360
1973	39563
1974	39700
1975	39556
1976	76314
1977	79336
1978	81531
1979	82586
1980	79756
1981	37758
1982	38243
1983	38014
1984	36660
1985	35496
1986	68733
1987	68141
1988	67441
1989	66283
1990	64939
1991	64706
1992	63263
1993	62946
1994	59748
1995	64261
1996	130051
1997	131906
1998	133350
1999	133289
2000	131735
2001	130241
2002	128160
2003	124550
2004	122863
2005	339380
2006	781672
2007	1037187
2008	1040422
2009	783241
2010	-13726
2011	-15738
2012	-16401
2013	-15566
2014	-14954
2015	-14154
2016	-13520
2017	-12895
2018	-8582
2019	-4466
2020	-2762
2021	-2762
2022	0
2023	0