Year	Number
1990	48717
1991	47581
1992	45652
1993	43671
1994	41722
1995	39917
1996	38403
1997	37235
1998	36493
1999	36082
2000	35931
2001	35682
2002	35208
2003	35081
2004	35051
2005	34920
2006	35052
2007	35185
2008	34694
2009	33607
2010	32304
2011	31190
2012	30450
2013	29854
2014	29444
2015	29101
2016	28573
2017	27865
2018	27083
2019	26403
2020	25715
2021	25333
2022	25144