Year	Number
1992	0.5775442397045901
1993	1.8638004289208638
1994	2.5274382244864433
1995	3.439979017510362
1996	3.224279164384085
1997	3.9337395606224796
1998	1.8161597450016373
1999	2.493513381928397
2000	3.067522082604533
2001	2.9309595356178795
2002	3.3231660514198778
2003	2.201972476609033
2004	1.7400502125331458
2005	2.4543066188736993
2006	4.57783576708187
2007	4.591315668982557
2008	1.9919826117260482
2009	5.587093656240858
2010	6.106577971575733
2011	3.131300655267036
2012	4.885246728386945
2013	2.8662524461896233
2014	2.4116685673665654
2015	2.5124177884718266
2016	2.3764414176657698
2017	4.408207117500948
2018	4.2069503863241
2019	4.670201972724554
2020	6.104466120838857
2021	4.4621325651236665
2022	2.8982235761862545
2023	3.5355338423324936