Year	Number
1996	9.78260898590088
1998	11.4130430221558
2000	10.3260869979858
2002	10.2702703475952
2003	13.5135135650635
2004	17.412935256958
2005	13.7254905700684
2006	15.6862745285034
2007	17.4757289886475
2008	19.4174766540527
2009	20.0956935882568
2010	22.0095691680908
2011	18.0094795227051
2012	14.6919431686401
2013	12.7962083816528
2014	13.4615383148193
2015	13.3333330154419
2016	11.4285717010498
2017	12.8571424484253
2018	13.8095235824585
2019	16.1904754638672
2020	14.2857141494751
2021	16.1904754638672
2022	16.9811325073242