Year	Number
1996	14.5
1998	18.4079608917236
2000	12.93532371521
2002	13.4328355789185
2003	20.8955230712891
2004	18.269229888916
2005	22.115385055542
2006	19.230770111084
2007	19.230770111084
2008	15.865385055542
2009	15.1658763885498
2010	13.7440757751465
2011	14.0845069885254
2012	15.4929580688477
2013	17.8403759002686
2014	21.674877166748
2015	22.660099029541
2016	22.660099029541
2017	22.660099029541
2018	21.8446598052979
2019	22.2222213745117
2020	23.1884059906006
2021	28.5024147033691
2022	28.019323348999