2005

6.3

1991

6.4

1967

7.4

1960

0.0

1978

7.1

1991

7.6

2002

8.6

1977

6.8

1999

8.2

1994

8.1

1986

7.9

1997

6.3

1991

6.5

1989

7.9

2002

6.2

1996

7.0

1961

6.6

1983

7.9

1998

7.8

1984

6.4