Year	Number
1996	21.1055278778076
1998	24.5
2000	26.3681583404541
2002	32.3383102416992
2003	28.8557205200195
2004	26.9230766296387
2005	27.7511959075928
2006	24.8803825378418
2007	24.8803825378418
2008	31.25
2009	28.9099521636963
2010	28.9099521636963
2011	29.577465057373
2012	34.7417831420898
2013	40.8450698852539
2014	37.980770111084
2015	38.0952377319336
2016	30.9523811340332
2017	30.9523811340332
2018	30.4761905670166
2019	24.761905670166
2020	20.4761905670166
2021	21.4285717010498
2022	23.5849056243896