Year	Number
1996	15.2173910140991
1998	13.043478012085
2000	10.3260869979858
2002	9.72972965240479
2003	13.5135135650635
2004	6.96517419815063
2005	20.5882358551025
2006	21.5686283111572
2007	19.9029121398926
2008	19.4174766540527
2009	22.0095691680908
2010	19.6172256469727
2011	20.8530807495117
2012	17.0616111755371
2013	17.5355453491211
2014	16.3461532592773
2015	15.7142858505249
2016	15.2380952835083
2017	16.1904754638672
2018	13.8095235824585
2019	13.3333330154419
2020	10.9523811340332
2021	12.8571424484253
2022	10.3773584365845