Year	Number
1996	47564
1997	48545
1998	46482
2000	44371
2001	43776
2002	43439
2003	44282
2004	44470
2005	44226
2006	43711
2007	42670
2008	40617
2009	36430
2010	34831
2011	33696
2012	32408
2013	31654
2014	31107
2016	30295
2017	29933
2018	30412
2019	30753
2020	31652
2021	32586