2006

5.2

1959

5.8

1999

8.3

1991

6.6

2001

7.5

1991

7.8

2005

8.0

1992

6.7

1994

6.2

1990

7.2

1992

7.5

2002

6.7

1997

5.0

2007

7.0

1993

0.0

1985

6.3

2000

7.0

1974

6.2

2001

6.6

2003

8.7