Year	Number
1960	-43749
1961	-49186
1962	-54566
1963	-59777
1964	-71948
1965	-87288
1966	-104955
1967	-113780
1968	-111222
1969	-81748
1970	-36455
1971	3219
1972	35014
1973	40182
1974	39146
1975	38725
1976	35245
1977	44937
1978	45001
1979	47175
1980	53078
1981	52138
1982	55830
1983	61000
1984	57744
1985	54953
1986	47774
1987	46192
1988	47815
1989	46755
1990	47663
1991	33925
1992	39196
1993	38883
1994	45272
1995	40855
1996	45356
1997	49960
1998	51856
1999	51687
2000	53527
2001	56959
2002	60505
2003	59438
2004	66585
2005	64009
2006	70170
2007	73940
2008	73804
2009	77265
2010	90016
2011	94709
2012	96056
2013	91528
2014	84532
2015	74170
2016	91623
2017	77733
2018	61632
2019	58986
2020	7557
2021	29089
2022	-1000
2023	-1000