2011

6.6

1965

6.7

1977

6.8

1981

6.5

2002

5.3

1999

7.3

1984

6.7

1989

7.4

2004

5.3

1989

5.5

1997

6.1

2001

6.6

1999

6.5

1969

7.0

2003

6.1

1999

6.1

1998

5.8

1991

6.9

1984

6.1

2001

6.9