1951

7.2

2001

5.5

1961

7.2

2005

6.4

1964

7.5

2014

6.8

1984

7.3

1942

6.9

2012

5.2

2013

6.1

2003

7.1

1948

7.0

2002

6.9

2002

7.3

2010

4.8

1980

6.2

2011

7.6

1994

6.5

2005

5.8

1959

8.1