Year	Number
1996	36.559139251709
1998	36.3636360168457
2000	42.5531921386719
2002	46.560848236084
2003	50.7936515808105
2004	52.2167472839355
2005	52.1951217651367
2006	52.1951217651367
2007	49.029125213623
2008	49.5145645141602
2009	45.4545440673828
2010	41.4285697937012
2011	47.3933639526367
2012	42.1800956726074
2013	40.2843589782715
2014	42.788459777832
2015	44.761905670166
2016	41.9047622680664
2017	42.3809509277344
2018	43.3333320617676
2019	46.1904754638672
2020	45.7142868041992
2021	42.3809509277344
2022	41.0377349853516