Year	Number
1996	13.1147537231445
1998	19.6721305847168
2000	15.8469944000244
2002	31.8918914794922
2003	29.7297306060791
2004	36.3184089660645
2005	40.1960792541504
2006	40
2007	35.9223289489746
2008	33.4951438903809
2009	37.7990417480469
2010	41.1483268737793
2011	37.9146919250488
2012	40.7582931518555
2013	40.2843589782715
2014	41.8269233703613
2015	36.6666679382324
2016	35.238094329834
2017	31.4285717010498
2018	35.7142868041992
2019	32.8571434020996
2020	31.9047622680664
2021	28.5714282989502
2022	32.5471687316895