Year	Number
1996	5.02512550354004
1998	6
2000	4.47761201858521
2002	4.47761201858521
2003	6.46766185760498
2004	6.73076915740967
2005	10.5263156890869
2006	7.17703342437744
2007	8.61244010925293
2008	10.5769233703613
2009	17.5355453491211
2010	20.3791465759277
2011	22.5352115631104
2012	15.962441444397
2013	18.3098583221436
2014	20.1923084259033
2015	27.1428565979004
2016	23.8095245361328
2017	24.761905670166
2018	23.8095245361328
2019	24.761905670166
2020	26.1904754638672
2021	23.8095245361328
2022	24.056604385376