Year	Number
1996	34829.82
1997	34295.03
1998	33117.69
1999	32493.5
2000	34252.57
2001	33653.44
2002	36459.85
2003	38304.38
2004	42219.28
2005	47311.56
2006	50105.47
2007	51515.11
2008	53341.54
2009	55418.16
2010	56445.35
2011	57416.69
2012	59356.98
2013	59601.41
2014	60186.35
2015	60544.98
2016	60405.13
2017	60547.79
2018	62057.65
2019	62742.71
2020	65821.57