Year	Number
1971	543
1972	807
1973	777
1974	825
1975	908
1976	934
1977	928
1980	830
1981	783
1982	787
1983	795
1984	730
1985	777
1986	779
1987	786
1988	835
1989	884
1990	887
1991	956
1992	1026
1993	1109
1994	1243
1995	1327
1996	1375
1997	1482
1998	1558
1999	1617
2000	1743
2001	1829
2002	1823
2003	1951
2004	1931
2005	1993
2006	1950
2007	2129
2008	2124
2011	2504
2012	2358
2013	2465
2014	2475
2015	2461.9150390625
2016	2609.69995117188
2017	2758.5
2019	2842.919921875
2020	2887
2021	2978.76489257812