Year	Number
1990	22320
1991	22510
1992	23183
1993	23228
1994	22723
1995	22561
1996	22306
1997	22027
1998	21679
1999	22686
2000	20643
2001	19789
2002	18690
2003	17485
2004	16320
2005	15250
2006	14270
2007	13408
2008	12645
2009	11941
2010	11288
2011	10716
2012	10215
2013	9796
2014	9479
2015	9233
2016	9036
2017	8913
2018	8847
2019	8808
2020	8795
2021	8760
2022	9073