2003

7.1

1990

6.4

2009

6.0

2007

7.1

2007

6.1

1960

8.0

1946

5.8

1998

6.3

1997

5.5

2006

6.3

1966

6.1

10.0

1976

6.8

1961

6.3

1975

6.2

1959

6.4

1971

5.8

2008

4.9

1951

6.2