1985

6.5

2001

6.0

2007

5.8

2008

6.2

1997

5.9

1995

5.8

2005

6.1

1980

7.0

2003

6.8

2023

6.6

1981

6.7

1990

7.4

2004

6.2

1972

5.8

2003

6.8

2003

6.7

1994

7.1

2006

7.0

2004

6.0

1988

6.7