Year	Number
1990	27382
1991	26780
1992	26252
1993	25894
1994	25831
1995	25595
1996	25370
1997	25052
1998	24681
1999	24247
2000	23724
2001	23161
2002	22649
2003	22504
2004	22069
2005	21988
2006	22010
2007	21959
2008	22308
2009	21793
2010	22266
2011	22688
2012	23550
2013	23898
2014	23757
2015	23810
2016	23028
2017	23321
2018	23897
2019	22894
2020	22434
2021	22773
2022	22624