Year	Number
1960	1573
1961	2981
1962	3343
1963	3197
1964	3224
1965	4555
1966	1298
1967	2531
1968	928
1969	312
1970	1377
1971	-6479
1972	-2600
1973	-1507
1974	-4090
1975	-6237
1976	-13915
1977	8204
1978	7434
1979	-20617
1980	15757
1981	-23640
1982	-22302
1983	23115
1984	21709
1985	-199505
1986	39136
1987	-108426
1988	-81562
1989	19392
1990	-601469
1991	-95155
1992	20292
1993	581818
1994	54355
1995	40424
1996	14652
1997	15429
1998	48446
1999	69491
2000	87624
2001	14451
2002	133839
2003	-27236
2004	69948
2005	51019
2006	-1204180
2007	-836565
2008	406488
2009	120311
2010	107297
2011	281089
2012	767449
2013	491588
2014	10514
2015	-19490
2016	-75580
2017	-9899
2018	6660
2019	-29880
2020	71539
2021	-60097
2022	-6000
2023	-6000