Year	Number
1996	13.8297872543335
1998	7.44680833816528
2000	2.64550256729126
2002	8.99470901489258
2003	3.01507544517517
2004	4.36893224716187
2005	7.76699018478394
2006	10.1449279785156
2007	13.043478012085
2008	15.865385055542
2009	21.3270149230957
2010	20.3791465759277
2011	20.8530807495117
2012	25.5924167633057
2013	28.4360198974609
2014	30
2015	24.2857151031494
2016	32.3809509277344
2017	28.0952377319336
2018	26.4150943756104
2019	26.8867931365967
2020	28.301887512207
2021	27.3584899902344
2022	29.2452831268311