1923

6.7

1961

8.4

1980

5.8

1956

7.1

2011

4.6

1995

5.1

2011

5.6

1957

7.0

1973

6.5

2012

7.3

2006

6.3

2007

5.7

1999

6.8

1982

5.2

1978

7.6

1950

6.8

2014

7.0

1963

6.5

2003

4.9

2002

5.5