Year	Number
1996	28.51
1997	45.95
1998	40.3
1999	42.5
2000	45.48
2001	42.87
2002	44.73
2003	46.42
2004	58.84
2005	60.94
2006	72.67
2007	93.97
2008	93.43
2009	117.13
2010	105.59
2011	127.92
2012	143.3
2013	178.71
2014	179.98
2015	179.25
2016	171.36
2017	205.58
2018	229.56
2019	264.53
2020	290.5