Year	Number
1990	32822
1991	29141
1992	28736
1993	28544
1994	28701
1995	28837
1996	29089
1997	29369
1998	29566
1999	29630
2000	29724
2001	29922
2002	30063
2003	32531
2004	29729
2005	29478
2006	29326
2007	29038
2008	28757
2009	28326
2010	27674
2011	27953
2012	31503
2013	31462
2014	29793
2015	31472
2016	29974
2017	30728
2018	32030
2019	29480
2020	28059
2021	28302
2022	27811