Year	Number
1996	7.60869550704956
1998	8.69565200805664
2000	7.0652174949646
2002	9.18918895721436
2003	11.8918914794922
2004	9.45273590087891
2005	10.2941179275513
2006	12.2549018859863
2007	16.5048542022705
2008	15.0485439300537
2009	15.3110046386719
2010	14.8325357437134
2011	12.3222751617432
2012	18.0094795227051
2013	15.6398105621338
2014	21.634614944458
2015	21.9047622680664
2016	15.2380952835083
2017	12.380952835083
2018	20.9523811340332
2019	18.0952377319336
2020	19.0476188659668
2021	27.1428565979004
2022	29.7169818878174