2002

7.3

1971

8.2

2005

7.5

1984

7.7

2000

7.1

1971

7.5

1988

7.8

1997

7.1

1999

7.0

2002

6.7

1990

7.8

2003

7.8

2006

6.7

2003

7.6

1984

7.5

1998

6.5

2001

7.9

1996

6.8

1998

7.1

1967

7.5