1982

7.6

2012

9.3

2004

5.9

1970

7.1

2017

6.2

1963

7.5

1973

7.1

2009

7.2

1971

7.3

1992

6.9

2008

6.9

1949

6.9

2009

7.9

2001

7.8

1971

7.4

1981

7.3

1997

4.8

1996

6.9

1956

7.1

1978

6.4