2016

6.3

2014

6.5

1988

7.3

2002

6.0

2007

8.1

2005

5.9

2007

7.1

1998

6.6

2006

5.8

2007

6.1

2009

7.1

1998

7.3

2005

5.7

1979

7.6

1991

6.6

1956

7.1

1960

7.6

1999

6.5

1999

6.7

1992

7.2