Year	Number
1996	29.1457290649414
1998	33.5
2000	39.3034820556641
2002	42.7860679626465
2003	39.8009948730469
2004	42.3076934814453
2005	41.1483268737793
2006	44.4976081848145
2007	46.8899536132813
2008	42.788459777832
2009	45.971565246582
2010	45.0236968994141
2011	44.6009407043457
2012	45.5399055480957
2013	43.1924896240234
2014	44.711540222168
2015	41.9047622680664
2016	38.0952377319336
2017	39.523811340332
2018	40.9523811340332
2019	44.2857131958008
2020	40.476188659668
2021	42.3809509277344
2022	40.0943412780762