Year	Number
1996	6.91489362716675
1998	11.702127456665
2000	11.1111106872559
2002	12.6984128952026
2003	13.5678396224976
2004	13.1067962646484
2005	11.1650485992432
2006	14.0096616744995
2007	13.5265703201294
2008	13.4615383148193
2009	10.9004735946655
2010	12.3222751617432
2011	13.7440757751465
2012	17.5355453491211
2013	17.0616111755371
2014	13.8095235824585
2015	15.2380952835083
2016	16.1904754638672
2017	13.8095235824585
2018	15.5660381317139
2019	14.6226415634155
2020	18.8679237365723
2021	18.8679237365723
2022	21.698112487793