Year	Number
1996	9.04522609710693
1998	7.5
2000	3.48258709907532
2002	4.97512435913086
2003	9.45273590087891
2004	10.0961542129517
2005	8.61244010925293
2006	14.8325357437134
2007	17.7033500671387
2008	16.8269233703613
2009	14.2180099487305
2010	12.7962083816528
2011	7.98122072219849
2012	8.45070457458496
2013	10.7981224060059
2014	7.692307472229
2015	7.14285707473755
2016	3.80952382087708
2017	1.90476191043854
2018	1.90476191043854
2019	2.38095235824585
2020	3.80952382087708
2021	2.85714292526245
2022	1.88679242134094