Year	Number
1996	25
1998	27.1739139556885
2000	26.6304340362549
2002	33.5135116577148
2003	24.8648643493652
2004	32.3383102416992
2005	19.1176471710205
2006	21.5686283111572
2007	19.9029121398926
2008	19.4174766540527
2009	22.9665069580078
2010	22.4880390167236
2011	23.6966819763184
2012	24.6445503234863
2013	25.5924167633057
2014	21.634614944458
2015	15.7142858505249
2016	17.619047164917
2017	15.7142858505249
2018	18.0952377319336
2019	17.619047164917
2020	20.4761905670166
2021	19.0476188659668
2022	20.2830181121826