Year	Number
1990	26179
1991	31078
1992	26039
1993	25317
1994	24149
1995	23135
1996	22548
1997	22571
1998	23238
1999	24000
2000	24066
2001	23216
2002	21843
2003	20376
2004	18988
2005	17807
2006	16861
2007	16225
2008	16172
2009	16405
2010	16940
2011	17384
2012	17412
2013	16715
2014	15454
2015	14007
2016	12809
2017	12380
2018	12968
2019	14345
2020	16120
2021	17958
2022	19290