Year	Number
1996	20.7446804046631
1998	22.340425491333
2000	19.5767192840576
2002	25.9259262084961
2003	30.1507530212402
2004	29.6116504669189
2005	36.8932037353516
2006	31.4009666442871
2007	28.019323348999
2008	29.8076915740967
2009	31.2796211242676
2010	33.1753540039063
2011	39.3364944458008
2012	37.9146919250488
2013	36.4928894042969
2014	29.5238094329834
2015	33.3333320617676
2016	27.619047164917
2017	35.238094329834
2018	32.0754699707031
2019	38.2075462341309
2020	40.0943412780762
2021	34.9056587219238
2022	27.3584899902344