1999

5.7

1985

6.2

2021

6.5

2009

6.3

1998

5.6

1993

6.0

1988

6.4

1987

7.3

2008

6.0

1977

6.3

2006

5.9

1995

6.2

1983

5.8

2005

5.9

2005

5.6

2004

6.3

2006

7.5

2003

7.2

2007

6.1

1986

6.7