Year	Number
1960	0
1961	-569
1962	-609
1963	-646
1964	-684
1965	-726
1966	-761
1967	-1175
1968	-1219
1969	-1256
1970	-1280
1971	-1296
1972	-552
1973	-314
1974	-247
1975	-281
1976	-690
1977	-710
1978	-727
1979	-734
1980	-737
1981	-551
1982	-411
1983	-399
1984	-536
1985	-746
1986	-946
1987	-1049
1988	-899
1989	-185
1990	879
1991	1946
1992	1294
1993	1662
1994	1668
1995	1598
1996	1636
1997	1656
1998	1786
1999	1828
2000	1235
2001	560
2002	350
2003	324
2004	315
2005	579
2006	569
2007	621
2008	666
2009	703
2010	498
2011	315
2012	229
2013	134
2014	88
2015	177
2016	170
2017	218
2018	367
2019	412
2020	0
2021	501
2022	164
2023	157