Year	Number
1996	86.16
1997	73.82
1998	73.97
1999	69.88
2000	64.24
2001	76.27
2002	51.99
2003	54.18
2004	42.64
2005	37.11
2006	48.87
2007	60.65
2008	60
2009	41.18
2010	50.73
2011	41.1
2012	62.17
2013	53.22
2014	63.6
2015	57.02
2016	58.44
2017	61.03
2018	62.96
2019	76.17
2020	59.61