Year	Number
1960	-17145
1961	-17494
1962	-17846
1963	-18217
1964	-18583
1965	-18968
1966	-19357
1967	-19748
1968	-20155
1969	-20562
1970	-20982
1971	-21407
1972	-21847
1973	-22301
1974	-22751
1975	-23214
1976	-23691
1977	-25325
1978	-26545
1979	-27112
1980	-26773
1981	-25521
1982	-24008
1983	-22173
1984	-19160
1985	-14678
1986	-11151
1987	-9098
1988	-17969
1989	-16888
1990	-15868
1991	-14971
1992	-14380
1993	-14335
1994	-13045
1995	-55482
1996	-75067
1997	-76708
1998	-79125
1999	-82761
2000	-87753
2001	-93742
2002	-99706
2003	-104794
2004	-102701
2005	-51360
2006	-24072
2007	-26971
2008	-28242
2009	-27870
2010	-25573
2011	-21770
2012	-20983
2013	-23747
2014	-30048
2015	-38355
2016	-39688
2017	-39672
2018	-39699
2019	-39769
2020	-86100
2021	-101468
2022	-29998
2023	-29914