Year	Number
1996	16.5
1998	34.3283576965332
2000	28.3582096099854
2002	19.9004974365234
2003	14.9253730773926
2004	19.230770111084
2005	45.6730766296387
2006	47.5961532592773
2007	49.519229888916
2008	49.519229888916
2009	48.8151664733887
2010	48.8151664733887
2011	46.0093879699707
2012	44.1314544677734
2013	41.3145523071289
2014	45.8128089904785
2015	46.305419921875
2016	49.2610855102539
2017	54.1871910095215
2018	52.4271850585938
2019	50.7246360778809
2020	52.1739120483398
2021	53.6231880187988
2022	54.5893707275391