Year	Number
1996	28.6432151794434
1998	30.5
2000	32.3383102416992
2002	32.8358192443848
2003	30.8457717895508
2004	35.0961532592773
2005	32.0574150085449
2006	30.6220092773438
2007	26.7942581176758
2008	24.0384616851807
2009	24.6445503234863
2010	28.4360198974609
2011	29.1079807281494
2012	32.3943672180176
2013	39.9061050415039
2014	49.038459777832
2015	45.238094329834
2016	46.1904754638672
2017	46.6666679382324
2018	47.6190490722656
2019	45.7142868041992
2020	40.476188659668
2021	46.1904754638672
2022	50.9433975219727