1995

6.5

1958

8.2

2005

7.0

2001

7.9

2002

6.3

1988

5.0

1971

6.8

2001

6.2

1998

7.1

2001

6.8

1962

7.7

2003

7.2

1997

6.7

1954

8.0

2006

6.6

1996

5.7

2003

7.4

2002

6.6

1994

6.2

1996

7.3