Year	Number
1989	35.92951
1994	35.39933
1995	37.15844
1996	34.54363
1997	35.74105
1999	34.10003
2000	32.22277
2001	36.29178
2002	37.88573
2003	32.15364
2004	34.20748
2005	33.54568
2006	32.99598
2007	32.91156
2009	32.33045
2010	32.47438
2011	31.98235
2012	29.7734
2013	35.77055
2014	36.61245
2015	27.45229
2016	27.13412