Year	Number
1996	20.2127666473389
1998	17.021276473999
2000	22.2222213745117
2002	36.5079383850098
2003	26.1306533813477
2004	25.2427177429199
2005	23.3009700775146
2006	19.8067626953125
2007	16.9082126617432
2008	22.5961532592773
2009	22.748815536499
2010	19.9052124023438
2011	21.3270149230957
2012	23.6966819763184
2013	21.3270149230957
2014	19.0476188659668
2015	19.0476188659668
2016	22.8571434020996
2017	20.4761905670166
2018	25
2019	21.2264156341553
2020	15.0943393707275
2021	13.6792449951172
2022	14.6226415634155