Year	Number
1996	19.5979900360107
1998	29.5
2000	34.825870513916
2002	25.3731346130371
2003	29.3532333374023
2004	31.730770111084
2005	22.9665069580078
2006	16.2679424285889
2007	15.3110046386719
2008	17.7884616851807
2009	14.6919431686401
2010	15.1658763885498
2011	17.3708915710449
2012	20.1877937316895
2013	16.4319248199463
2014	12.9807691574097
2015	17.619047164917
2016	25.7142848968506
2017	26.6666660308838
2018	25.238094329834
2019	23.8095245361328
2020	19.5238094329834
2021	17.619047164917
2022	17.4528293609619