Year	Number
1996	12.5683059692383
1998	13.6612024307251
2000	10.9289617538452
2002	17.8378372192383
2003	15.6756753921509
2004	18.9054718017578
2005	17.1568622589111
2006	21.9512195587158
2007	25.2427177429199
2008	25.2427177429199
2009	22.4880390167236
2010	22.0095691680908
2011	27.962085723877
2012	38.3886260986328
2013	35.5450248718262
2014	31.730770111084
2015	30
2016	24.2857151031494
2017	24.2857151031494
2018	28.0952377319336
2019	25.238094329834
2020	19.0476188659668
2021	18.0952377319336
2022	27.8301887512207