1962

6.9

2004

7.1

1967

5.0

1967

4.1

1963

5.1

2006

4.3

2002

6.5

1969

7.0

1997

5.6

1983

6.5

1994

5.8

1994

5.9

1993

6.2

2006

5.5

1954

6.8

2001

6.5

1990

6.5

1992

6.0

2003

6.8

2006

6.5