Year	Number
1990	13.493174204050755
1991	9.265655818090954
1992	23.149273654059982
1993	62.09542362824764
1994	49.484941505615026
1995	9.492276976577909
1996	2.242658329930421
1997	1.8727585705191936
1998	2.4021373374707635
1999	1.6207233691462226
2000	1.001455183168078
2001	0.9008231627082063
2002	0.843147883813327
2003	0.8538915022170078
2004	0.8549983807560168
2005	0.8731112379009637
2006	0.8714160425962646
2007	0.9826452672295933
2008	1.0543216237864057
2009	1.366501368540326
2010	1.6606981171189572
2011	2.2473204964506506
2012	2.0126532611607013
2013	2.627217629575258