2003

5.6

2001

5.2

2005

6.3

2002

6.0

1958

6.9

1966

7.5

2009

6.2

2005

7.1

2011

6.2

1976

6.6

1990

5.8

2007

7.6

2006

6.8

1990

6.0

1960

8.3

1977

6.3

1963

7.7

2003

6.1

1953

7.9

2005

5.5