Year	Number
1996	9.04255294799805
1998	7.97872352600098
2000	12.1693124771118
2002	9.5238094329834
2003	5.52763795852661
2004	3.88349509239197
2005	18.4466018676758
2006	17.8743953704834
2007	17.8743953704834
2008	13.4615383148193
2009	19.9052124023438
2010	12.3222751617432
2011	9.95260620117188
2012	10.4265403747559
2013	18.0094795227051
2014	29.5238094329834
2015	7.61904764175415
2016	8.5714282989502
2017	8.09523773193359
2018	11.3207550048828
2019	11.7924528121948
2020	12.7358493804932
2021	17.9245281219482
2022	18.8679237365723