Year	Number
1996	86
1998	85.572135925293
2000	74.6268692016602
2002	84.5771179199219
2003	87.5621871948242
2004	85.0961532592773
2005	85.5769195556641
2006	80.288459777832
2007	78.3653869628906
2008	79.3269195556641
2009	77.2511825561523
2010	78.1990509033203
2011	78.8732376098633
2012	80.7511749267578
2013	81.2206573486328