Year	Number
1990	26478
1991	25855
1992	25294
1993	24820
1994	24414
1995	24064
1996	23744
1997	23442
1998	24936
1999	22888
2000	22646
2001	22498
2002	22143
2003	21908
2004	21951
2005	21617
2006	21238
2007	20972
2008	20640
2009	20251
2010	27906
2011	19297
2012	18824
2013	18341
2014	17895
2015	17492
2016	17173
2017	16952
2018	16664
2019	16266
2020	16081
2021	16160
2022	15856