2013

8.1

1977

7.3

2000

6.3

2002

5.8

1995

7.5

1971

6.6

1981

5.6

1985

5.3

1975

6.4

1987

7.1

2006

6.9

2009

5.8

2003

5.4

1928

8.0

1956

7.2

1996

5.8

1955

7.0

2007

6.6

2014

7.0

1983

5.7