Year	Number
1997	6000
1998	7000
1999	13000
2000	13000
2001	20000
2002	27000
2003	13000
2004	28000
2005	63000
2006	67000
2007	71000
2008	73000
2009	72000
2010	76000
2011	99000
2012	104000
2013	111000
2014	93000
2015	61000
2016	92000
2017	110000
2018	112000
2019	122000