Year	Number
1996	29.1457290649414
1998	32.5
2000	32.8358192443848
2002	20.8955230712891
2003	29.3532333374023
2004	24.0384616851807
2005	21.5311012268066
2006	19.1387557983398
2007	11.0047845840454
2008	8.65384578704834
2009	30.8056869506836
2010	33.6492881774902
2011	25.3521118164063
2012	25.8215961456299
2013	24.8826293945313
2014	20.6730766296387
2015	15.7142858505249
2016	24.2857151031494
2017	22.380952835083
2018	20
2019	21.9047622680664
2020	23.3333339691162
2021	21.9047622680664
2022	19.8113212585449