Year	Number
1990	33070
1991	29377
1992	28977
1993	28791
1994	28953
1995	29095
1996	29354
1997	29641
1998	29846
1999	29917
2000	30017
2001	30222
2002	30370
2003	32845
2004	30050
2005	29806
2006	29663
2007	29382
2008	29107
2009	28680
2010	28028
2011	28306
2012	31853
2013	31807
2014	30307
2015	31809
2016	30309
2017	31061
2018	32405
2019	29813
2020	28393
2021	28638
2022	28150