Year	Number
1996	0.546448111534119
1998	1.63934421539307
2000	2.7322404384613
2002	2.16216206550598
2003	1.62162160873413
2004	1.49253726005554
2005	2.94117641448975
2006	1.46341466903687
2007	2.42718458175659
2008	5.82524251937866
2009	14.8325357437134
2010	11.9617223739624
2011	14.2180099487305
2012	7.10900497436523
2013	8.53080558776855
2014	15.384614944458
2015	11.9047622680664
2016	12.8571424484253
2017	13.8095235824585
2018	14.2857141494751
2019	14.2857141494751
2020	12.380952835083
2021	25.7142848968506
2022	23.1132068634033