Year	Number
1960	-188440
1961	-205025
1962	-229888
1963	-245127
1964	-255568
1965	-245764
1966	-307481
1967	-301604
1968	-336077
1969	-354926
1970	-361170
1971	-422103
1972	-425097
1973	-421375
1974	-437618
1975	-480011
1976	-545538
1977	-377121
1978	-407114
1979	-414347
1980	-578629
1981	-888158
1982	-829347
1983	-778837
1984	-854760
1985	-896013
1986	-998183
1987	-976212
1988	-901776
1989	-925597
1990	-611893
1991	-765144
1992	-708422
1993	-765727
1994	-690362
1995	-774756
1996	-779877
1997	-756490
1998	-757797
1999	-831760
2000	-885591
2001	-900280
2002	-898046
2003	-956655
2004	-880999
2005	-1002623
2006	-984488
2007	-957221
2008	-983051
2009	-904729
2010	-532871
2011	-431943
2012	-431998
2013	-471825
2014	-418607
2015	-349708
2016	-63719
2017	-208064
2018	-335073
2019	-388361
2020	-150854
2021	-260632
2022	-188081
2023	-177527