Year	Number
1996	10.0502510070801
1998	9.5
2000	10.4477615356445
2002	8.4577112197876
2003	5.97014904022217
2004	6.73076915740967
2005	10.0478467941284
2006	11.4832534790039
2007	12.9186601638794
2008	16.3461532592773
2009	16.5876770019531
2010	14.2180099487305
2011	17.3708915710449
2012	9.38967132568359
2013	13.1455402374268
2014	12.9807691574097
2015	12.8571424484253
2016	17.619047164917
2017	17.1428565979004
2018	18.5714282989502
2019	19.0476188659668
2020	21.4285717010498
2021	20.4761905670166
2022	20.2830181121826