Year	Number
1996	17
1998	19.9004974365234
2000	19.9004974365234
2002	21.3930339813232
2003	17.412935256958
2004	13.942307472229
2005	9.13461494445801
2006	8.65384578704834
2007	8.65384578704834
2008	8.65384578704834
2009	9.00473976135254
2010	10.4265403747559
2011	10.7981224060059
2012	9.85915470123291
2013	10.3286380767822
2014	10.837438583374
2015	11.3300495147705
2016	11.822660446167
2017	11.822660446167
2018	8.73786449432373
2019	9.17874431610107
2020	11.1111106872559
2021	11.5942029953003
2022	8.21256065368652