Year	Number
1984	53806
1985	52643
1986	51671
1987	50472
1988	48937
1989	47919
1990	48099
1991	48828
1992	48959
1993	48517
1994	47773
1995	46793
1996	45258
1997	42937
1998	40101
1999	37218
2000	34721
2001	32574
2002	30622
2003	28450
2004	26533
2005	24946
2006	23590
2007	22745
2008	21971
2009	20898
2010	19393
2011	17745
2012	16381
2013	15441
2014	14747
2015	14057
2016	13289
2017	12539
2018	12256
2019	12144
2020	11908
2021	11345
2022	10517