Year	Number
1990	16719
1991	16307
1992	16063
1993	16108
1994	16213
1995	16203
1996	15943
1997	15561
1998	15190
1999	14885
2000	14686
2001	14626
2002	14669
2003	14773
2004	14860
2005	14882
2006	14720
2007	14323
2008	13652
2009	12805
2010	11976
2011	11308
2012	10862
2013	10714
2014	10793
2015	10998
2016	11223
2017	11453
2018	11720
2019	12159
2020	12989
2021	14298
2022	15745