1967

7.3

1960

0.0

1978

7.1

1991

7.6

1999

8.2

1994

8.1

1991

6.3

1989

7.9

1996

6.9

1961

6.6

1983

7.9

1984

6.4

1999

6.4

1993

7.9

2004

3.5

1985

6.8

2004

6.2

2003

8.4

1996

7.8

1999

8.4