Year	Number
1990	43610
1991	36441
1992	35095
1993	33726
1994	32457
1995	31152
1996	29911
1997	28719
1998	27538
1999	26350
2000	25132
2001	23901
2002	22723
2003	24141
2004	20884
2005	20373
2006	20131
2007	19987
2008	19934
2009	19997
2010	20012
2011	21020
2012	24625
2013	25481
2014	25026
2015	25012
2016	23058
2017	23336
2018	23993
2019	21349
2020	19862
2021	19955
2022	18777