2007

7.3

2008

6.1

1987

7.7

2011

5.0

1995

5.8

1991

6.8

1984

6.0

2003

7.8

2006

7.4

2004

7.1

1929

6.0

1941

5.8

1962

6.5

1950

6.6

1986

6.3

1996

6.7

2008

5.9

1986

8.0

1953

7.2

2000

7.1