2014

6.4

2006

5.2

1999

6.6

1991

5.3

2001

6.6

1993

6.3

2004

5.2

2003

5.0

2005

6.2

2007

5.6

2002

6.8

2001

6.6

2002

5.3

2002

6.2

2005

6.3

1992

7.0

1992

6.6

1981

6.5

2001

5.9

2005

6.3