Year	Number
1996	37.5
1998	38.3084564208984
2000	26.8656711578369
2002	26.8656711578369
2003	26.8656711578369
2004	25.9615383148193
2005	29.8076915740967
2006	31.25
2007	26.4423084259033
2008	22.115385055542
2009	26.0663509368896
2010	27.962085723877
2011	31.9248828887939
2012	34.2723007202148
2013	37.0892028808594
2014	39.4088668823242
2015	40.3940887451172
2016	39.4088668823242
2017	37.9310340881348
2018	38.3495140075684
2019	36.2318840026855
2020	35.2657012939453
2021	34.7826080322266
2022	33.8164253234863