Year	Number
1960	-182081
1961	-339570
1962	-335133
1963	-436140
1964	-481145
1965	-405390
1966	-650873
1967	-576226
1968	-654150
1969	-774418
1970	-865276
1971	-1126700
1972	-973910
1973	-1033448
1974	-1171418
1975	-1238608
1976	-972217
1977	-829420
1978	-1743983
1979	-724048
1980	756214
1981	270649
1982	-354270
1983	-900223
1984	-1215895
1985	-629202
1986	-1059937
1987	-789210
1988	-928934
1989	-779196
1990	-367666
1991	-1183669
1992	-2064503
1993	-544081
1994	-870140
1995	-1038096
1996	-1345447
1997	-1022974
1998	-1145571
1999	-1448079
2000	-837260
2001	-1568446
2002	-2843522
2003	-2764915
2004	-2645786
2005	-3488739
2006	-3459267
2007	-3809765
2008	-4357312
2009	-3546474
2010	-2662770
2011	-2516189
2012	-3385298
2013	-2006410
2014	-2645764
2015	-3562894
2016	-2933199
2017	-2794985
2018	-3459029
2019	-3358742
2020	-969809
2021	-1393606
2022	-1988789
2023	-2019645