Year	Number
1998	9.10433
1999	9.42769
2000	9.73203
2001	9.1166
2002	9.10739
2003	9.03226
2004	8.86007
2005	9.16959
2006	9.18552
2007	9.21212
2008	8.9424
2009	8.68793