1986

7.6

2006

5.6

1995

8.4

1931

8.1

2004

7.2

1993

5.5

2005

6.9

2002

7.6

1990

2.5

1994

7.0

1966

7.3

1999

7.0

2006

6.9

2006

6.0

2008

6.6

2001

6.3

2002

7.0

1997

6.0

1998

5.4

1972

6.2