Year	Number
1996	7.10382509231567
1998	8.19672107696533
2000	6.01092910766602
2002	5.94594573974609
2003	4.86486482620239
2004	1.99004971981049
2005	3.43137264251709
2006	3.90243911743164
2007	3.88349509239197
2008	2.91262125968933
2009	1.91387557983398
2010	2.39234447479248
2011	2.36966824531555
2012	4.26540279388428
2013	3.79146909713745
2014	8.65384578704834
2015	8.09523773193359
2016	14.7619047164917
2017	12.380952835083
2018	12.8571424484253
2019	10.4761905670166
2020	14.7619047164917
2021	7.61904764175415
2022	5.66037750244141