Year	Number
1996	3.80434775352478
1998	6.52173900604248
2000	10.3260869979858
2002	14.0540542602539
2003	18.9189186096191
2004	18.4079608917236
2005	22.0588226318359
2006	21.5686283111572
2007	22.3300971984863
2008	27.6699028015137
2009	30.1435413360596
2010	27.2727279663086
2011	27.962085723877
2012	23.6966819763184
2013	24.6445503234863
2014	30.769229888916
2015	27.1428565979004
2016	25.238094329834
2017	26.1904754638672
2018	28.0952377319336
2019	30.4761905670166
2020	25.7142848968506
2021	35.238094329834
2022	32.5471687316895