Year	Number
1996	0.502512574195862
1998	1.5
2000	0.497512429952621
2002	2.98507452011108
2003	3.98009943962097
2004	3.8461537361145
2005	8.13397121429443
2006	22.0095691680908
2007	20.5741634368896
2008	12.0192308425903
2009	16.1137447357178
2010	17.0616111755371
2011	18.3098583221436
2012	20.6572761535645
2013	19.7183094024658
2014	23.0769233703613
2015	19.5238094329834
2016	17.619047164917
2017	16.1904754638672
2018	16.1904754638672
2019	16.1904754638672
2020	15.7142858505249
2021	18.0952377319336
2022	19.3396224975586