2005

5.5

1966

5.8

1999

5.4

2001

7.3

1997

6.8

2005

6.7

2005

6.8

1998

7.2

1992

7.4

1972

3.7

1987

7.1

2001

7.4

1991

5.9

1989

7.0

2003

5.8

2006

7.4

1995

6.5

2003

6.4

1990

6.7

2006

5.4