Year	Number
1996	23.4042549133301
1998	30.319149017334
2000	29.100528717041
2002	20.1058197021484
2003	29.1457290649414
2004	23.3009700775146
2005	28.1553401947021
2006	13.5265703201294
2007	23.6714973449707
2008	19.7115383148193
2009	20.8530807495117
2010	24.1706161499023
2011	19.4312801361084
2012	19.4312801361084
2013	17.5355453491211
2014	17.1428565979004
2015	17.1428565979004
2016	17.1428565979004
2017	18.5714282989502
2018	20.2830181121826
2019	23.5849056243896
2020	23.5849056243896
2021	23.5849056243896
2022	22.1698112487793