1971

7.8

1988

5.6

1962

6.8

1974

5.8

1985

6.8

1975

7.3

1985

4.8

1972

7.4

2003

9.2

1999

7.0

2005

7.4

2000

8.5

1983

7.5

1995

6.3

1989

6.0

2002

9.0

2004

7.5

2003

7.5

1997

7.0

1982

6.3