Year	Number
1996	4.02010059356689
1998	4.5
2000	4.47761201858521
2002	0.995024859905243
2003	1.49253726005554
2004	0.961538434028625
2005	0.956937789916992
2006	3.82775115966797
2007	3.82775115966797
2008	3.36538457870483
2009	3.3175356388092
2010	2.84360194206238
2011	4.22535228729248
2012	6.1032862663269
2013	9.38967132568359
2014	8.17307662963867
2015	7.61904764175415
2016	18.5714282989502
2017	16.6666660308838
2018	15.7142858505249
2019	13.8095235824585
2020	10.9523811340332
2021	5.7142858505249
2022	5.66037750244141