Year	Number
1996	65.89
1997	46.94
1998	49.16
1999	50.56
2000	42.75
2001	59.24
2002	50.59
2003	64.62
2004	65.36
2005	79.85
2006	84.53
2007	100.07
2008	118.15
2009	116.8
2010	120.33
2011	130.28
2012	155.23
2013	155.73
2014	164.86
2015	163.95
2016	151.05
2017	175.02
2018	171.52
2019	255.68
2020	258.87