Year	Number
1990	25617
1991	24523
1992	23581
1993	22553
1994	21682
1995	20950
1996	20573
1997	20205
1998	20036
1999	19772
2000	19978
2001	19995
2002	20098
2003	20254
2004	20043
2005	19883
2006	20154
2007	20148
2008	19543
2009	18673
2010	17940
2011	17663
2012	17621
2013	17383
2014	17251
2015	16879
2016	16444
2017	15944
2018	15600
2019	15288
2020	14562
2021	13927
2022	13059