Year	Number
1960	-181634
1961	-197399
1962	-223092
1963	-237438
1964	-245935
1965	-233130
1966	-291669
1967	-282565
1968	-313639
1969	-328396
1970	-331675
1971	-400672
1972	-416314
1973	-415474
1974	-430464
1975	-468359
1976	-529048
1977	-355369
1978	-375536
1979	-385025
1980	-546004
1981	-831260
1982	-770690
1983	-719864
1984	-797083
1985	-846012
1986	-951833
1987	-933934
1988	-862231
1989	-888986
1990	-580828
1991	-751994
1992	-702067
1993	-763790
1994	-692125
1995	-778168
1996	-781048
1997	-768053
1998	-768336
1999	-841692
2000	-887172
2001	-897433
2002	-895319
2003	-949656
2004	-866736
2005	-981496
2006	-957924
2007	-932208
2008	-964656
2009	-888412
2010	-514668
2011	-416902
2012	-416369
2013	-458340
2014	-417951
2015	-339557
2016	78679
2017	377456
2018	696616
2019	380712
2020	261813
2021	141522
2022	-426651
2023	-434430