Year	Number
1996	39.1959800720215
1998	38.5
2000	37.3134346008301
2002	45.2736320495605
2003	44.2786064147949
2004	44.230770111084
2005	39.2344512939453
2006	40.6698570251465
2007	37.3205757141113
2008	37.5
2009	42.6540298461914
2010	44.5497627258301
2011	43.6619720458984
2012	44.1314544677734
2013	45.0704231262207
2014	45.1923065185547
2015	45.7142868041992
2016	45.238094329834
2017	44.761905670166
2018	40.9523811340332
2019	44.2857131958008
2020	48.0952377319336
2021	42.8571434020996
2022	41.5094337463379