Year	Number
1990	32980
1991	31654
1992	30422
1993	29317
1994	28324
1995	27434
1996	26611
1997	25820
1998	28902
1999	24320
2000	23601
2001	23052
2002	22272
2003	21662
2004	21625
2005	20849
2006	19994
2007	19415
2008	18792
2009	18167
2010	27205
2011	16770
2012	16149
2013	15582
2014	15066
2015	14605
2016	14246
2017	13958
2018	13587
2019	13104
2020	12803
2021	12799
2022	12296