Year	Number
1960	-6168
1961	-6753
1962	-7080
1963	-7157
1964	-6915
1965	-6443
1966	-5790
1967	-4968
1968	-4264
1969	-3636
1970	-3104
1971	-2625
1972	-2219
1973	-1776
1974	-1397
1975	-1037
1976	-707
1977	-412
1978	-157
1979	81
1980	268
1981	438
1982	499
1983	507
1984	461
1985	381
1986	454
1987	482
1988	498
1989	537
1990	606
1991	726
1992	860
1993	1049
1994	1296
1995	1530
1996	1489
1997	1608
1998	1748
1999	1804
2000	1799
2001	1687
2002	1507
2003	1238
2004	872
2005	456
2006	183
2007	350
2008	918
2009	1774
2010	3049
2011	4806
2012	6167
2013	7348
2014	8474
2015	9443
2016	10239
2017	10836
2018	11180
2019	11247
2020	10854
2021	10408
2022	850
2023	850