Year	Number
1996	19.3548393249512
1998	18.1818180084229
2000	23.9361705780029
2002	24.3386249542236
2003	22.7513236999512
2004	27.5862064361572
2005	22.9268283843994
2006	22.9268283843994
2007	28.6407775878906
2008	33.980583190918
2009	34.9282302856445
2010	37.1428565979004
2011	24.6445503234863
2012	25.1184825897217
2013	24.1706161499023
2014	34.1346168518066
2015	36.1904754638672
2016	37.6190490722656
2017	40.476188659668
2018	33.3333320617676
2019	32.3809509277344
2020	31.4285717010498
2021	31.9047622680664
2022	38.6792449951172