Year	Number
1996	18.8172035217285
1998	24.5989303588867
2000	22.340425491333
2002	31.2169303894043
2003	25.9259262084961
2004	26.1083736419678
2005	23.4146347045898
2006	30.7317066192627
2007	30.5825233459473
2008	30.0970878601074
2009	25.8373203277588
2010	28.0952377319336
2011	27.014217376709
2012	32.2274894714355
2013	37.9146919250488
2014	40.8653831481934
2015	39.0476188659668
2016	40
2017	33.3333320617676
2018	36.6666679382324
2019	38.0952377319336
2020	40.476188659668
2021	37.6190490722656
2022	36.7924537658691