Year	Number
1974	36.7541
1975	35.56716
1976	38.33333
1977	36.92308
1979	35.07692
1986	29.06977
1987	27.97674
1988	26.24242
1990	24.62921
1991	22.46
1992	18.51852
1993	22.90076
1999	18.31429
2000	14.99275
2001	17.69231
2002	15.88148
2003	11.91111
2004	13.42222
2005	14.04575
2006	13.90345
2007	13.83824
2008	14.85926
2009	13.50714
2010	13.80292
2011	10.7929
2012	10.8375
2013	12.53691
2014	12.89063
2015	11.35333
2016	11.27027