2001

5.8

2011

5.2

1985

5.3

1953

7.0

2004

7.1

2002

5.1

1951

7.5

1952

7.0

1989

5.1

1997

5.1

2004

6.1

1956

7.6

2009

5.8

2001

7.1

2009

7.3

1990

6.1

2010

6.2

2011

5.7

1920

7.9

2012

5.5