Year	Number
1985	22.13462
1986	32.63043
1988	12.48113
1989	17.21277
1992	18.96629
1993	16.2931
1994	18.48485
2008	13.62712
2009	15.73529
2010	20.05952
2011	20.17978
2013	15.1165
2014	12.46207
2015	10.57692