Year	Number
1996	32.1608047485352
1998	33.5
2000	30.348258972168
2002	31.343282699585
2003	23.3830852508545
2004	21.634614944458
2005	29.6650714874268
2006	30.6220092773438
2007	35.4067001342773
2008	36.538459777832
2009	35.5450248718262
2010	34.1232223510742
2011	36.6197166442871
2012	29.1079807281494
2013	33.3333320617676
2014	33.6538467407227
2015	35.7142868041992
2016	36.1904754638672
2017	37.6190490722656
2018	37.6190490722656
2019	39.523811340332
2020	40.9523811340332
2021	39.0476188659668
2022	40.0943412780762