Year	Number
1971	24815
1972	24834
1973	24850
1974	25241
1975	25308
1976	26374
1978	28492
1979	26049
1980	26369
1981	27525
1982	27561
1983	27731
1984	27942
1985	28175
1986	32806
1987	33100
1988	33330
1989	33594
1990	33796
1991	34232
1992	34902
1993	33507
1994	32059
1995	32634
1996	30674
1997	31251
1998	31716
1999	28890
2002	29129
2003	28822
2004	28397
2005	29239
2006	29044
2007	29274
2008	29017
2009	29179
2010	29743
2011	29957
2012	30203.90234375
2013	30565.955078125
2014	30533.423828125
2015	30972.43359375
2016	31933.224609375
2017	33438.03125
2019	32234.33984375
2020	32150.228515625
2021	32848.0859375
2022	31243.015625