Year	Number
1990	41190
1991	40125
1992	38295
1993	36484
1994	34783
1995	33281
1996	32070
1997	31169
1998	30650
1999	30410
2000	30380
2001	30208
2002	29787
2003	29716
2004	29745
2005	29677
2006	29881
2007	30063
2008	29613
2009	28584
2010	27373
2011	26399
2012	25830
2013	25400
2014	25125
2015	24879
2016	24422
2017	23781
2018	23075
2019	22488
2020	21905
2021	21632
2022	21547