Year	Number
1960	-342
1961	-374
1962	-388
1963	-397
1964	-401
1965	-416
1966	-577
1967	-894
1968	-1052
1969	-1073
1970	-1084
1971	-1094
1972	-1109
1973	-1127
1974	-992
1975	-1026
1976	-1152
1977	-2180
1978	-2363
1979	-2511
1980	-2629
1981	-2683
1982	-2712
1983	-2698
1984	-2619
1985	-2553
1986	-2433
1987	-1781
1988	-1875
1989	-1977
1990	-2068
1991	-2147
1992	-2187
1993	-2187
1994	-2143
1995	-2109
1996	-2116
1997	-1567
1998	-1648
1999	-1646
2000	-1617
2001	-1647
2002	-1712
2003	-1754
2004	-1793
2005	-1812
2006	-1813
2007	-1985
2008	-2085
2009	-2079
2010	-1948
2011	-2048
2012	-2529
2013	-2558
2014	-2524
2015	-2495
2016	-2206
2017	-2106
2018	-2023
2019	-1898
2020	-948
2021	-948
2022	-800
2023	-800