Year	Number
1990	44941
1991	43618
1992	40209
1993	36534
1994	30941
1995	27401
1996	24620
1997	22639
1998	21722
1999	21240
2000	20825
2001	20294
2002	19655
2003	18811
2004	18466
2005	18131
2006	17965
2007	17844
2008	17570
2009	17149
2010	16702
2011	16492
2012	16601
2013	16544
2014	16414
2015	15793
2016	15149
2017	14407
2018	13056
2019	11200
2020	10214
2021	9519
2022	8940