Year	Number
1990	18299
1991	18072
1992	17835
1993	17562
1994	17247
1995	16848
1996	16361
1997	15823
1998	15326
1999	14824
2000	14368
2001	13991
2002	13647
2003	13298
2004	24324
2005	12664
2006	12422
2007	12202
2008	11995
2009	11742
2010	11489
2011	11219
2012	10941
2013	10681
2014	10439
2015	10232
2016	10077
2017	9967
2018	9864
2019	9760
2020	9644
2021	9536
2022	9397