1998

7.0

1999

7.5

1969

7.6

2010

5.8

2006

6.4

1987

5.7

1972

7.9

2011

6.9

1962

7.1

1955

8.0

2007

6.7

2014

6.5

1956

7.1

1977

6.3

2009

6.0

2004

6.8

1959

8.1

2001

6.1

1969

7.0

2007

6.9