1993

6.8

1961

7.9

1957

7.9

1956

7.9

2010

6.1

2013

6.4

1969

7.3

2006

5.8

1958

7.5

1968

7.4

1965

6.9

1970

8.2

1988

6.3

1989

5.6

1921

8.2

2001

7.6

1960

8.4

1986

7.6

1968

6.5

2007

6.3