1996

7.3

1953

7.8

1958

7.5

1963

7.3

1998

8.1

1987

7.6

2015

6.8

2004

7.0

1962

7.9

2006

7.1

2002

7.0

2006

6.7

2004

6.3

1977

6.2

1985

7.7

2006

6.6

2007

6.1

1997

6.0

1959

3.8

2006

6.1