Year	Number
1996	40.5
1998	48.756217956543
2000	51.7412948608398
2002	56.7164192199707
2003	60.1990051269531
2004	58.1730766296387
2005	59.1346168518066
2006	56.25
2007	57.211540222168
2008	58.1730766296387
2009	57.8199043273926
2010	57.3459701538086
2011	55.8685455322266
2012	56.3380279541016
2013	56.3380279541016
2014	59.1133003234863
2015	58.6206893920898
2016	57.6354675292969
2017	59.1133003234863
2018	59.7087364196777
2019	57.487922668457
2020	57.0048294067383
2021	56.5217399597168
2022	58.4541053771973