1985

7.7

1992

5.3

2001

6.1

2007

5.5

1954

7.2

2004

6.4

2002

5.2

1966

7.5

2004

7.0

1999

6.8

1985

5.8

1964

7.4

2007

6.4

1984

7.5

1974

7.2

2003

7.9

1999

6.1

1970

7.1

2008

7.2

1987

7.0