Year	Number
1996	26.5
1998	26.8656711578369
2000	29.3532333374023
2002	27.3631839752197
2003	27.8606967926025
2004	35.5769233703613
2005	32.6923065185547
2006	25
2007	19.7115383148193
2008	18.75
2009	19.4312801361084
2010	18.9573459625244
2011	17.3708915710449
2012	21.1267604827881
2013	20.1877937316895
2014	16.7487678527832
2015	16.7487678527832
2016	16.2561569213867
2017	15.2709360122681
2018	14.0776700973511
2019	13.5265703201294
2020	14.0096616744995
2021	17.3913040161133
2022	20.2898559570313