Year	Number
1996	15.5
1998	15.4228858947754
2000	12.93532371521
2002	12.93532371521
2003	9.95024871826172
2004	5.76923084259033
2005	8.65384578704834
2006	9.13461494445801
2007	10.5769233703613
2008	28.8461532592773
2009	35.0710906982422
2010	34.5971565246582
2011	30.9859161376953
2012	24.8826293945313
2013	25.3521118164063
2014	26.6009845733643
2015	23.645320892334
2016	19.7044334411621
2017	18.7192115783691
2018	18.9320392608643
2019	25.1207733154297
2020	29.9516906738281
2021	32.8502426147461
2022	32.8502426147461