Year	Number
1996	1
1998	0.497512429952621
2000	0.995024859905243
2002	9.45273590087891
2003	14.4278602600098
2004	15.384614944458
2005	14.9038457870483
2006	17.7884616851807
2007	18.75
2008	14.4230766296387
2009	9.47867298126221
2010	9.95260620117188
2011	11.2676057815552
2012	14.0845069885254
2013	14.5539903640747
2014	16.2561569213867
2015	18.7192115783691
2016	20.6896553039551
2017	22.1674880981445
2018	20.3883495330811
2019	21.2560386657715
2020	19.8067626953125
2021	7.24637699127197
2022	2.4154589176178