Year	Number
1996	40.2010040283203
1998	35.5
2000	30.348258972168
2002	25.3731346130371
2003	27.3631839752197
2004	29.3269233703613
2005	31.1004791259766
2006	28.7081336975098
2007	29.6650714874268
2008	31.25
2009	32.7014236450195
2010	33.1753540039063
2011	33.3333320617676
2012	34.7417831420898
2013	39.9061050415039
2014	43.269229888916
2015	42.3809509277344
2016	38.0952377319336
2017	39.0476188659668
2018	40.9523811340332
2019	44.2857131958008
2020	48.0952377319336
2021	40.9523811340332
2022	41.0377349853516