Year	Number
1996	14.8936166763306
1998	25
2000	19.5767192840576
2002	29.100528717041
2003	30.1507530212402
2004	32.5242729187012
2005	35.9223289489746
2006	33.8164253234863
2007	32.8502426147461
2008	28.8461532592773
2009	31.2796211242676
2010	32.2274894714355
2011	30.3317527770996
2012	35.5450248718262
2013	26.0663509368896
2014	36.6666679382324
2015	35.238094329834
2016	28.0952377319336
2017	25.238094329834
2018	19.3396224975586
2019	22.6415100097656
2020	26.4150943756104
2021	28.301887512207
2022	25.4716987609863