Year	Number
1996	15.8469944000244
1998	7.10382509231567
2000	14.7540979385376
2002	15.6756753921509
2003	16.2162170410156
2004	13.9303483963013
2005	15.6862745285034
2006	21.9512195587158
2007	15.5339803695679
2008	11.6504850387573
2009	10.5263156890869
2010	9.56937789916992
2011	8.05687236785889
2012	18.9573459625244
2013	15.1658763885498
2014	22.5961532592773
2015	18.0952377319336
2016	16.1904754638672
2017	19.0476188659668
2018	20
2019	27.1428565979004
2020	19.5238094329834
2021	17.619047164917
2022	15.5660381317139