Year	Number
1996	14.5
1998	13.4328355789185
2000	12.93532371521
2002	18.9054718017578
2003	14.4278602600098
2004	17.7884616851807
2005	10.5769233703613
2006	16.8269233703613
2007	15.384614944458
2008	14.9038457870483
2009	14.6919431686401
2010	14.6919431686401
2011	15.962441444397
2012	15.4929580688477
2013	15.023473739624
2014	10.837438583374
2015	10.3448276519775
2016	12.8078813552856
2017	11.822660446167
2018	9.70873832702637
2019	10.1449279785156
2020	5.31400966644287
2021	4.8309178352356
2022	6.7632851600647