Year	Number
1990	22109
1991	35593
1992	21767
1993	21837
1994	21883
1995	21775
1996	21129
1997	19558
1998	17067
1999	14529
2000	12652
2001	11697
2002	11543
2003	11931
2004	12662
2005	13403
2006	13900
2007	14011
2008	13615
2009	12833
2010	11945
2011	11140
2012	10394
2013	9736
2014	9191
2015	8803
2016	8553
2017	8328
2018	8010
2019	7610
2020	7180
2021	6764
2022	6370