Year	Number
1990	28736
1991	26963
1992	28062
1993	28785
1994	29294
1995	29608
1996	29720
1997	29486
1998	28974
1999	30913
2000	28012
2001	27703
2002	27641
2003	27745
2004	27845
2005	27758
2006	27496
2007	26995
2008	26364
2009	25732
2010	25058
2011	24315
2012	23647
2013	22962
2014	22303
2015	21727
2016	21231
2017	20910
2018	20663
2019	20536
2020	20385
2021	20321
2022	20203