2004

6.4

1972

6.3

2003

4.4

2002

6.2

1986

7.0

1973

7.1

1987

7.2

1994

5.8

2003

6.5

1996

5.7

2008

6.2

2005

6.2

1971

7.1

2002

7.6

2006

6.6

2008

5.7

1992

7.0

1989

6.6

1933

7.6

1987

8.0