Year	Number
1996	4.02010059356689
1998	5.5
2000	2.98507452011108
2002	1.99004971981049
2003	0.497512429952621
2004	2.88461542129517
2005	4.30622005462646
2006	8.13397121429443
2007	9.09090900421143
2008	11.057692527771
2009	7.5829381942749
2010	9.00473976135254
2011	9.38967132568359
2012	12.2065725326538
2013	15.023473739624
2014	12.9807691574097
2015	11.9047622680664
2016	11.9047622680664
2017	9.5238094329834
2018	11.9047622680664
2019	8.5714282989502
2020	11.9047622680664
2021	17.619047164917
2022	14.6226415634155