Year	Number
1960	2344
1961	-1995
1962	-10512
1963	-17416
1964	-21275
1965	-24045
1966	-26429
1967	-26277
1968	-26361
1969	-26316
1970	-26696
1971	-27068
1972	-24157
1973	-22267
1974	-21077
1975	-19790
1976	-18150
1977	-16875
1978	-15087
1979	-13965
1980	-12117
1981	-10985
1982	-10558
1983	-10463
1984	-9430
1985	-8661
1986	-7507
1987	-6563
1988	-4833
1989	-3187
1990	-701
1991	3255
1992	10003
1993	20837
1994	33409
1995	48732
1996	66293
1997	86309
1998	108637
1999	133216
2000	161157
2001	186701
2002	210510
2003	230387
2004	247447
2005	261300
2006	272651
2007	279808
2008	283762
2009	284800
2010	281588
2011	277521
2012	272601
2013	268067
2014	261389
2015	254218
2016	246940
2017	239014
2018	230577
2019	221179
2020	211063
2021	202027
2022	165790
2023	165790