Year	Number
1996	44.5
1998	48.756217956543
2000	47.2636833190918
2002	45.2736320495605
2003	39.3034820556641
2004	36.538459777832
2005	35.0961532592773
2006	42.788459777832
2007	43.269229888916
2008	41.3461532592773
2009	41.2322273254395
2010	38.8625602722168
2011	38.4976539611816
2012	40.3755874633789
2013	41.3145523071289
2014	39.4088668823242
2015	38.9162559509277
2016	38.4236450195313
2017	37.9310340881348
2018	36.4077682495117
2019	35.2657012939453
2020	36.7149772644043
2021	35.7487907409668
2022	34.7826080322266