Year	Number
1996	64.3216094970703
1998	66.5
2000	63.1840782165527
2002	63.6815910339355
2003	59.2039794921875
2004	54.3269233703613
2005	53.1100463867188
2006	47.8468894958496
2007	50.7177047729492
2008	49.038459777832
2009	48.3412322998047
2010	49.2891006469727
2011	50.2347412109375
2012	50.7042236328125
2013	48.8262901306152
2014	52.8846168518066
2015	52.3809509277344
2016	46.1904754638672
2017	50.476188659668
2018	49.523811340332
2019	49.0476188659668
2020	48.0952377319336
2021	47.6190490722656
2022	46.698112487793