Year	Number
1960	-10332
1961	-10165
1962	-10843
1963	-11980
1964	-13252
1965	-13693
1966	-17072
1967	-16944
1968	-18058
1969	-18341
1970	-17521
1971	-22180
1972	-19647
1973	-19183
1974	-22508
1975	-26632
1976	-34088
1977	-28926
1978	-31602
1979	-32438
1980	-30239
1981	-34216
1982	-34232
1983	-34214
1984	-47454
1985	-63524
1986	-82188
1987	-91198
1988	-88203
1989	-75987
1990	-68856
1991	-77380
1992	-70975
1993	-68995
1994	-63686
1995	-67932
1996	-68134
1997	-56107
1998	-30323
1999	-21740
2000	-17423
2001	-12530
2002	-8926
2003	-11780
2004	-10805
2005	-17436
2006	-18275
2007	-19966
2008	-24538
2009	-34428
2010	-34523
2011	-43216
2012	-140747
2013	-41013
2014	-50149
2015	-48947
2016	-30294
2017	-33995
2018	-40761
2019	-44428
2020	-14978
2021	-22236
2022	-39998
2023	-39998