1962

6.9

2001

6.4

2003

5.7

1972

7.5

1993

6.4

1998

7.2

1967

5.0

1967

4.1

1963

5.1

2003

4.1

1997

5.6

1987

6.6

2005

6.2

1994

5.9

1993

6.2

1994

5.2

1985

6.7

1992

6.0

2006

6.5

1996

7.1