Year	Number
1960	-19418
1961	-41561
1962	-29267
1963	-57523
1964	-47413
1965	-34401
1966	-28290
1967	-24525
1968	-26517
1969	-25803
1970	-26172
1971	-39372
1972	-47253
1973	-51797
1974	-52945
1975	-52014
1976	-58073
1977	-32181
1978	-30603
1979	-27391
1980	-17644
1981	-26896
1982	-32757
1983	-37417
1984	-51472
1985	-56186
1986	-104360
1987	-110291
1988	-107903
1989	-109031
1990	-104908
1991	-130743
1992	-118907
1993	-121197
1994	-115414
1995	-97336
1996	-98110
1997	-95238
1998	-94306
1999	-91664
2000	-90376
2001	-84706
2002	-91645
2003	-108908
2004	-66711
2005	-58941
2006	-72241
2007	-73718
2008	-78864
2009	-82207
2010	-70490
2011	-67369
2012	-65136
2013	-67026
2014	-72062
2015	-81202
2016	-57256
2017	-71807
2018	-89007
2019	-91959
2020	-33807
2021	-46242
2022	-39998
2023	-39998