Year	Number
1996	32.4468078613281
1998	28.1914901733398
2000	37.5661392211914
2002	38.0952377319336
2003	35.6783905029297
2004	40.2912635803223
2005	40.7766990661621
2006	46.8599052429199
2007	50.7246360778809
2008	46.1538467407227
2009	41.2322273254395
2010	45.0236968994141
2011	48.8151664733887
2012	43.1279602050781
2013	45.0236968994141
2014	40
2015	39.0476188659668
2016	40
2017	34.2857131958008
2018	38.2075462341309
2019	36.3207550048828
2020	39.1509437561035
2021	20.2830181121826
2022	19.8113212585449