1995

6.2

1969

7.8

2007

6.7

1992

3.8

1972

5.2

1966

5.5

1973

6.9

1973

7.5

2002

6.7

1981

6.2

2008

6.9

1998

5.8

2003

6.9

1962

7.0

1963

7.1

1967

6.6

1977

6.8

1987

6.5

1956

7.5

2005

7.1