Year	Number
1996	19.1489353179932
1998	29.7872333526611
2000	14.2857141494751
2002	15.8730154037476
2003	20.1005020141602
2004	16.019416809082
2005	19.4174766540527
2006	13.5265703201294
2007	16.9082126617432
2008	15.384614944458
2009	14.6919431686401
2010	19.4312801361084
2011	19.9052124023438
2012	19.4312801361084
2013	19.4312801361084
2014	29.0476188659668
2015	28.5714282989502
2016	31.4285717010498
2017	30
2018	25.943395614624
2019	22.6415100097656
2020	25.943395614624
2021	27.8301887512207
2022	32.5471687316895