Year	Number
1996	46610.69
1997	49416.52
1998	49672.35
1999	49210.64
2000	50006.98
2001	50801.94
2002	51494.97
2003	52659.44
2004	54976.7
2005	59436.01
2006	62294.75
2007	63247.3
2008	66278.1
2009	67841.08
2010	68299.86
2011	70130.47
2012	71646.01
2013	72641.06
2014	72165.9
2015	71454.24
2016	70742.15
2017	69328.55
2018	67682.67
2019	65758.26
2020	66478.55