Year	Number
1990	33269
1991	31947
1992	30720
1993	29616
1994	28624
1995	27732
1996	26903
1997	26099
1998	29164
1999	24563
2000	23824
2001	23255
2002	22460
2003	21837
2004	21793
2005	21009
2006	20149
2007	19565
2008	18937
2009	18307
2010	27338
2011	16898
2012	16270
2013	15700
2014	15183
2015	14722
2016	14364
2017	14079
2018	13710
2019	13265
2020	12926
2021	12923
2022	12420