2010

4.6

2009

4.5

1951

7.6

1974

7.8

2004

7.9

2007

7.0

2016

5.7

1959

8.1

1942

7.4

1998

6.6

1964

7.0

1963

7.6

2011

7.6

1953

7.9

1979

7.8

2005

7.1

1940

7.1

1982

6.3

1981

6.7

2013

5.6