Year	Number
1996	7.5
1998	5.97014904022217
2000	3.48258709907532
2002	3.48258709907532
2003	1.49253726005554
2004	1.44230771064758
2005	1.92307686805725
2006	1.92307686805725
2007	1.92307686805725
2008	1.92307686805725
2009	2.36966824531555
2010	3.3175356388092
2011	5.16431903839111
2012	7.98122072219849
2013	12.6760559082031
2014	16.2561569213867
2015	21.1822662353516
2016	30.0492610931396
2017	28.5714282989502
2018	27.6699028015137
2019	28.5024147033691
2020	28.9855079650879
2021	10.1449279785156
2022	6.28019332885742