Year	Number
1960	-99337
1961	-108748
1962	-113654
1963	-115226
1964	-116960
1965	-123211
1966	-126471
1967	-132757
1968	-143420
1969	-155330
1970	-193554
1971	56182
1972	41305
1973	44642
1974	45390
1975	43650
1976	43767
1977	42134
1978	38455
1979	36763
1980	29423
1981	-6136
1982	-12429
1983	-13806
1984	-15283
1985	-16080
1986	-16732
1987	-20860
1988	-22820
1989	-28937
1990	-33704
1991	-35318
1992	-7612
1993	11901
1994	22141
1995	30130
1996	35377
1997	39207
1998	43501
1999	49266
2000	63195
2001	57075
2002	45651
2003	28311
2004	17114
2005	17155
2006	18775
2007	21954
2008	10008
2009	15657
2010	-11820
2011	-24048
2012	-37448
2013	-36657
2014	-30033
2015	-10124
2016	-8128
2017	5244
2018	10177
2019	43656
2020	40535
2021	27295
2022	9999
2023	9999