Year	Number
1996	25.543478012085
1998	26.6304340362549
2000	26.0869560241699
2002	22.7027034759521
2003	27.027027130127
2004	29.8507461547852
2005	29.4117641448975
2006	27.4509811401367
2007	29.1262130737305
2008	28.6407775878906
2009	28.7081336975098
2010	28.2296657562256
2011	29.3838863372803
2012	27.962085723877
2013	28.9099521636963
2014	30.769229888916
2015	34.2857131958008
2016	32.3809509277344
2017	34.761905670166
2018	38.0952377319336
2019	39.0476188659668
2020	42.8571434020996
2021	37.6190490722656
2022	36.3207550048828