2001

6.4

1995

6.7

2000

7.0

2004

7.1

1998

5.6

2003

5.9

1970

7.2

1948

7.2

1999

7.1

2002

7.6

1984

6.4

2005

5.8

2003

6.3

2008

5.7

2006

6.9

2004

7.2

1956

7.2

2000

6.0

2002

6.6

1988

7.8