Year	Number
1960	-49098
1961	-49408
1962	-51733
1963	-54423
1964	-55765
1965	-53597
1966	-61249
1967	-58937
1968	-63183
1969	-66191
1970	-66058
1971	-84692
1972	-77748
1973	-75658
1974	-80843
1975	-84511
1976	-98130
1977	-67662
1978	-67880
1979	-63678
1980	-49253
1981	-56188
1982	-46855
1983	-29939
1984	-34909
1985	-35855
1986	-48299
1987	-44372
1988	-32292
1989	-27370
1990	-17237
1991	-48488
1992	-29969
1993	-30020
1994	-16033
1995	-33016
1996	-28154
1997	-23520
1998	-25134
1999	-30850
2000	-31116
2001	-27618
2002	-24379
2003	-33007
2004	-25907
2005	-41348
2006	-39142
2007	-49575
2008	-63246
2009	-46902
2010	-34185
2011	-46273
2012	-55913
2013	-64686
2014	-67516
2015	-41064
2016	79978
2017	415618
2018	494364
2019	395803
2020	229437
2021	211978
2022	-167924
2023	-175051