2009

5.8

1964

7.4

2006

5.0

2012

6.1

2010

5.7

1989

6.2

2011

5.8

1985

6.1

1984

7.1

2009

7.1

2007

6.3

2009

7.2

1979

7.3

1931

8.3

1999

6.1

2010

6.8

1987

5.7

2007

6.4

1990

5.5

1975

6.8