Year	Number
1996	16.5
1998	27.3631839752197
2000	30.8457717895508
2002	41.2935333251953
2003	41.7910461425781
2004	39.9038467407227
2005	40.3846168518066
2006	41.8269233703613
2007	45.1923065185547
2008	45.6730766296387
2009	45.0236968994141
2010	44.0758285522461
2011	43.1924896240234
2012	43.6619720458984
2013	43.1924896240234
2014	46.7980308532715
2015	45.8128089904785
2016	45.320198059082
2017	46.305419921875
2018	44.6601943969727
2019	42.9951705932617
2020	40.5797119140625
2021	41.062801361084
2022	42.9951705932617