Year	Number
1996	19.25
1997	24.5
1998	29.19
1999	28.87
2000	27.79
2001	43.08
2002	38
2003	45.11
2004	54.09
2005	37.07
2006	49.7
2007	49.82
2008	44.99
2009	36.63
2010	29.06
2011	36.23
2012	47.49
2013	41.83
2014	44.89
2015	54.38
2016	54.32
2017	50.16
2018	41.69
2019	49.47
2020	67.79