Year	Number
1984	61377
1985	63315
1986	65085
1987	66132
1988	66668
1989	66472
1990	65352
1991	64387
1992	63601
1993	62477
1994	61368
1995	60570
1996	59773
1997	58748
1998	57281
1999	55673
2000	54208
2001	52748
2002	51270
2003	49532
2004	47485
2005	45448
2006	43354
2007	41682
2008	40669
2009	40067
2010	39487
2011	39458
2012	40038
2013	40831
2014	41774
2015	41465
2016	40471
2017	38740
2018	35682
2019	33087
2020	31881
2021	31338
2022	30912