Year	Number
1960	-155327
1961	-221620
1962	-232922
1963	-239948
1964	-241630
1965	-242177
1966	-250618
1967	-236043
1968	-235037
1969	-250039
1970	-208125
1971	-226375
1972	-221928
1973	-220160
1974	-249665
1975	-191812
1976	-138957
1977	-89147
1978	-100900
1979	-124344
1980	-134411
1981	-151928
1982	-173001
1983	-175518
1984	-188441
1985	-185754
1986	-199600
1987	-219289
1988	-215159
1989	-209926
1990	-149089
1991	-198673
1992	-179039
1993	-169227
1994	-147940
1995	-143386
1996	5539
1997	-3109
1998	-24139
1999	-59467
2000	-122971
2001	-185071
2002	-195877
2003	-204925
2004	-182951
2005	-223074
2006	-235227
2007	-217909
2008	-190626
2009	-232359
2010	-183268
2011	-103875
2012	-156051
2013	-199869
2014	-237890
2015	6954
2016	79051
2017	36111
2018	-15371
2019	-24066
2020	-41937
2021	-80125
2022	-69996
2023	-69996