Year	Number
1996	27.7173919677734
1998	25
2000	21.7391300201416
2002	21.0810813903809
2003	18.9189186096191
2004	18.9054718017578
2005	24.5098037719727
2006	22.5490188598633
2007	25.2427177429199
2008	32.5242729187012
2009	33.4928245544434
2010	34.4497604370117
2011	32.2274894714355
2012	27.488151550293
2013	22.748815536499
2014	16.3461532592773
2015	11.9047622680664
2016	9.5238094329834
2017	10.4761905670166
2018	10.4761905670166
2019	10.9523811340332
2020	14.7619047164917
2021	19.0476188659668
2022	14.6226415634155