Year	Number
1996	21.1956520080566
1998	20.1086959838867
2000	17.3913040161133
2002	18.3783779144287
2003	14.5945949554443
2004	9.95024871826172
2005	9.31372547149658
2006	9.31372547149658
2007	8.73786449432373
2008	10.1941747665405
2009	8.13397121429443
2010	10.5263156890869
2011	9.95260620117188
2012	13.2701425552368
2013	10.9004735946655
2014	6.73076915740967
2015	5.7142858505249
2016	6.1904764175415
2017	5.2380952835083
2018	7.61904764175415
2019	7.61904764175415
2020	6.1904764175415
2021	5.2380952835083
2022	6.13207530975342