1989

4.2

1974

7.6

1974

6.6

2007

6.4

1994

3.9

1991

8.3

1996

7.9

1965

6.4

2006

7.4

1963

5.0

2003

6.6

2002

6.2

1998

7.1

2004

7.5

2000

6.7

2003

7.4

2005

6.3

1935

6.4

2008

5.4

1995

6.3