1999

8.0

1981

7.2

1980

6.0

1990

6.0

1969

6.9

1939

7.9

1972

7.1

1958

7.8

1966

7.7

1970

6.2

2012

5.2

1989

7.4

2012

6.8

2008

5.9

1994

6.3

2003

7.8

1972

6.6

1973

7.3

1996

6.7

1985

7.2