2002

5.6

1991

6.5

1994

6.1

1984

6.5

2005

6.1

1983

6.2

2008

7.0

1999

6.1

1984

6.3

1985

6.0

1992

7.2

2008

6.2

2007

6.4

2005

5.4

1989

6.1

2003

5.5

2009

5.2

2006

6.0

2008

5.3

1998

6.3