Year	Number
1990	9613
1991	9863
1992	10078
1993	10238
1994	10388
1995	10498
1996	10583
1997	10674
1998	10715
1999	10749
2000	10736
2001	10691
2002	10580
2003	10449
2004	10254
2005	10003
2006	9643
2007	9169
2008	13918
2009	8078
2010	7564
2011	7134
2012	6739
2013	6391
2014	6073
2015	5811
2016	5606
2017	5476
2018	5359
2019	5234
2020	5152
2021	5091
2022	5036