Year	Number
1996	4
1998	5.47263669967651
2000	4.47761201858521
2002	2.98507452011108
2003	11.9402980804443
2004	8.17307662963867
2005	17.3076915740967
2006	18.75
2007	23.0769233703613
2008	22.115385055542
2009	26.0663509368896
2010	27.962085723877
2011	25.3521118164063
2012	23.9436626434326
2013	24.4131450653076
2014	21.674877166748
2015	22.660099029541
2016	23.645320892334
2017	23.645320892334
2018	25.2427177429199
2019	25.6038646697998
2020	26.0869560241699
2021	28.9855079650879
2022	28.5024147033691