1972

7.4

1992

6.6

1994

6.8

1971

7.1

1989

7.2

2000

7.1

1996

7.3

1981

7.2

1990

7.3

1935

6.6

1993

6.9

1932

0.0

2008

0.0

1961

5.5

1978

6.0

1995

6.4

2003

7.0

1956

7.1

1958

7.0

2006

6.3