Year	Number
1996	6.45161294937134
1998	5.34759378433228
2000	8.51063823699951
2002	17.4603176116943
2003	10.0529098510742
2004	19.7044334411621
2005	17.0731716156006
2006	12.1951217651367
2007	14.5631065368652
2008	17.9611644744873
2009	21.0526313781738
2010	21.4285717010498
2011	22.748815536499
2012	18.9573459625244
2013	21.3270149230957
2014	15.384614944458
2015	14.7619047164917
2016	13.3333330154419
2017	14.7619047164917
2018	13.8095235824585
2019	11.9047622680664
2020	6.66666650772095
2021	4.7619047164917
2022	4.71698093414307