1927

8.1

1995

7.6

1985

7.7

2005

6.5

1982

7.9

1982

6.6

1988

7.9

1970

6.1

1971

6.4

1972

6.2

1973

5.7

1966

7.1

2005

6.7

1999

6.8

2001

0.0

1976

6.5

1999

7.1

1981

7.1

1991

7.3

1995

7.3