Year	Number
1994	14.25453
1995	14.03944
1996	13.77713
1997	14.30468
1998	14.52377
1999	14.1771
2000	14.1882
2001	14.07295
2002	14.21836
2003	14.09175
2004	14.92088
2005	14.97577
2006	14.96129
2007	15.10841
2008	15.15258
2009	15.02419
2010	15.76573
2011	15.74543
2012	15.84233
2013	16.10151
2014	12.26957
2015	11.86985
2017	13.79578