Year	Number
1996	14.5
1998	10.4477615356445
2000	10.4477615356445
2002	6.46766185760498
2003	7.96019887924194
2004	5.76923084259033
2005	5.76923084259033
2006	3.36538457870483
2007	4.32692289352417
2008	3.8461537361145
2009	3.79146909713745
2010	3.79146909713745
2011	8.92018795013428
2012	26.7605628967285
2013	25.3521118164063
2014	21.674877166748
2015	17.2413787841797
2016	13.3004922866821
2017	13.7931032180786
2018	13.1067962646484
2019	14.0096616744995
2020	16.425121307373
2021	14.4927539825439
2022	16.9082126617432