Year	Number
1960	15509
1961	11097
1962	8098
1963	8763
1964	17018
1965	29737
1966	41882
1967	50397
1968	50036
1969	40481
1970	25894
1971	8976
1972	-2622
1973	-8072
1974	-12024
1975	-14822
1976	-17309
1977	-15132
1978	-13701
1979	-7706
1980	1735
1981	9659
1982	16944
1983	21487
1984	24316
1985	28040
1986	30763
1987	34646
1988	39873
1989	50941
1990	66103
1991	75826
1992	85370
1993	81580
1994	61531
1995	27992
1996	-2650
1997	-23017
1998	-27035
1999	-27528
2000	-26074
2001	-22895
2002	-18467
2003	-11700
2004	7979
2005	3500
2006	502609
2007	-18108
2008	767
2009	-49687
2010	4872
2011	7057
2012	-146181
2013	776237
2014	803008
2015	490844
2016	49192
2017	41956
2018	33554
2019	28963
2020	18092
2021	14374
2022	-141192
2023	-157392