Year	Number
1996	23.1182804107666
1998	26.7379684448242
2000	30.8510646820068
2002	35.4497337341309
2003	39.6825408935547
2004	40.3940887451172
2005	42.4390258789063
2006	39.5121955871582
2007	35.4368934631348
2008	36.8932037353516
2009	32.0574150085449
2010	28.0952377319336
2011	34.5971565246582
2012	30.8056869506836
2013	28.9099521636963
2014	30.769229888916
2015	33.8095245361328
2016	31.9047622680664
2017	30
2018	32.8571434020996
2019	34.761905670166
2020	34.761905670166
2021	29.5238094329834
2022	29.7169818878174