Year	Number
1996	36.82
1997	26.52
1998	31.89
1999	23.84
2000	22.34
2001	18.38
2002	24.53
2003	22.82
2004	17.91
2005	25.77
2006	26.47
2007	41.65
2008	52.48
2009	68.39
2010	124.82
2011	141.38
2012	155.25
2013	150.4
2014	156.68
2015	167.07
2016	170.85
2017	135.3
2018	168.55
2019	191.03
2020	167.16