1997

7.4

1993

6.5

1999

6.8

2005

4.5

1985

6.3

2000

7.0

1974

6.2

1977

7.2

1986

7.0

2006

7.7

2001

6.6

1987

8.4

1993

7.4

1986

7.7

1992

6.5

2001

7.7

1966

6.4

1974

0.0

2000

7.9

2002

7.1