Year	Number
1994	14.07831
1995	14.88808
1997	25.97102
2000	15.55606
2002	20.95248
2003	21.68103
2004	18.94906
2005	16.22323
2006	15.8077
2007	16.16082
2008	15.23849
2009	16.92375
2010	17.59193
2011	17.82806
2012	16.18232
2013	19.59875
2014	19.45219
2015	19.07336
2017	17.56537