2005

4.5

1985

6.3

2000

7.0

1974

6.2

1986

7.0

2006

7.6

2001

6.6

1993

7.4

2001

7.7

1966

6.4

2002

7.1

2003

8.7

2006

7.5

1999

0.0

2003

8.1

2006

5.2

2000

5.0

1990

5.7

2004

7.9

1990

7.1