1998

6.8

1965

6.7

1985

6.2

1997

7.2

2002

6.4

1985

10.0

2004

7.2

1971

6.5

1972

6.0

1993

6.2

1960

7.6

2005

7.2

1976

7.3

2006

7.4

2005

6.9

2007

7.4

2004

6.8

1993

6.4

1986

4.7

1998

6.9