Year	Number
1996	24.29
1997	11.29
1998	20.67
1999	23.01
2000	17.35
2001	15.8
2002	23.93
2003	32.59
2004	40.04
2005	45.62
2006	43.74
2007	47.38
2008	48.67
2009	40.4
2010	41.36
2011	46.01
2012	53.73
2013	50.62
2014	70.67
2015	78.31
2016	75.85
2017	66.45
2018	62.02
2019	73.99
2020	72.62