Year	Number
1996	3.82513666152954
1998	5.46448087692261
2000	4.37158489227295
2002	8.64864826202393
2003	16.2162170410156
2004	10.945273399353
2005	13.235294342041
2006	21.9512195587158
2007	25.2427177429199
2008	20.8737869262695
2009	20.5741634368896
2010	18.1818180084229
2011	18.4834117889404
2012	21.8009471893311
2013	13.2701425552368
2014	15.384614944458
2015	12.380952835083
2016	13.8095235824585
2017	13.3333330154419
2018	13.3333330154419
2019	13.3333330154419
2020	11.9047622680664
2021	12.8571424484253
2022	12.2641506195068