Year	Number
1996	68.5
1998	66.1691513061523
2000	69.1542282104492
2002	71.1442794799805
2003	67.164176940918
2004	69.2307662963867
2005	70.6730804443359
2006	73.0769195556641
2007	71.6346130371094
2008	72.1153869628906
2009	71.0900497436523
2010	70.6161117553711
2011	72.3004684448242
2012	71.8309860229492
2013	70.4225387573242
2014	70.9359588623047
2015	71.9211807250977
2016	71.9211807250977
2017	73.8916244506836
2018	71.8446578979492
2019	71.9806747436523
2020	70.5314025878906
2021	67.6328506469727
2022	67.1497573852539