Year	Number
1960	-28261
1961	-18255
1962	-19639
1963	-26268
1964	-22835
1965	-24941
1966	-23205
1967	-20570
1968	-19212
1969	-21238
1970	-7771
1971	-5579
1972	-2422
1973	-1499
1974	-1701
1975	-383
1976	-3895
1977	-6679
1978	-7604
1979	-5099
1980	-8196
1981	-10088
1982	-10967
1983	-10727
1984	-10612
1985	-13613
1986	-16541
1987	-16537
1988	-16055
1989	-17424
1990	-8238
1991	-4808
1992	-6082
1993	-7941
1994	-8199
1995	-8680
1996	-9170
1997	-10803
1998	-7644
1999	-7546
2000	-22489
2001	-28052
2002	-28183
2003	-29216
2004	-32210
2005	-33430
2006	-33275
2007	-32608
2008	-30804
2009	-29338
2010	-33742
2011	-38794
2012	-45035
2013	-52866
2014	-64956
2015	-64764
2016	-65824
2017	-62275
2018	-17320
2019	-16013
2020	-7408
2021	-7408
2022	16702
2023	19835