Year	Number
1995	35.12202
1999	17.43115
2000	19.67009
2001	18.84711
2002	18.90387
2003	19.13273
2004	17.94168
2005	18.64831
2006	22.20117
2007	18.65314
2009	18.57329
2010	20.3617
2012	17.31217
2014	17.41565
2015	17.15369
2016	17.63607