Year	Number
1990	71019
1991	69382
1992	67420
1993	65694
1994	64263
1995	63006
1996	61677
1997	60239
1998	58712
1999	58309
2000	55364
2001	53641
2002	51864
2003	50156
2004	48562
2005	47222
2006	46193
2007	45433
2008	44655
2009	43689
2010	42463
2011	41395
2012	39115
2013	37558
2014	36591
2015	36174
2016	36279
2017	36218
2018	36461
2019	36861
2020	37637
2021	38844
2022	40197