Year	Number
1996	1.63934421539307
1998	3.82513666152954
2000	3.27868843078613
2002	1.08108103275299
2003	3.78378367424011
2004	6.46766185760498
2005	7.84313726425171
2006	5.85365867614746
2007	12.1359224319458
2008	21.8446598052979
2009	24.4019145965576
2010	28.2296657562256
2011	27.488151550293
2012	28.9099521636963
2013	28.9099521636963
2014	25
2015	21.4285717010498
2016	19.5238094329834
2017	19.0476188659668
2018	17.619047164917
2019	15.2380952835083
2020	17.1428565979004
2021	17.619047164917
2022	20.7547168731689