Year	Number
1996	9.57446765899658
1998	12.2340421676636
2000	13.7566137313843
2002	25.3968257904053
2003	21.1055278778076
2004	29.6116504669189
2005	18.4466018676758
2006	19.3236713409424
2007	15.9420289993286
2008	15.865385055542
2009	14.6919431686401
2010	13.2701425552368
2011	12.3222751617432
2012	18.4834117889404
2013	20.3791465759277
2014	30.4761905670166
2015	21.4285717010498
2016	20
2017	20.4761905670166
2018	19.3396224975586
2019	18.8679237365723
2020	17.9245281219482
2021	18.3962268829346
2022	16.9811325073242