1997

6.1

1996

7.2

2002

8.4

1993

8.6

1975

5.0

1982

7.6

1966

7.2

1961

8.0

1957

7.8

2001

7.4

1998

8.2

1979

6.9

1979

7.4

1987

7.6

1973

1.0

2004

7.9

1977

7.1

1997

8.4

1989

0.0

1977

5.0