Year	Number
1996	23.9361705780029
1998	18.6170215606689
2000	16.4021167755127
2002	16.9312171936035
2003	13.5678396224976
2004	16.019416809082
2005	12.62135887146
2006	15.4589376449585
2007	11.1111106872559
2008	10.0961542129517
2009	9.47867298126221
2010	12.7962083816528
2011	12.7962083816528
2012	10.4265403747559
2013	13.7440757751465
2014	9.0476188659668
2015	9.5238094329834
2016	10
2017	11.9047622680664
2018	12.2641506195068
2019	12.7358493804932
2020	14.6226415634155
2021	15.0943393707275
2022	15.0943393707275