2015

6.3

1997

7.9

2010

8.2

1994

7.0

2010

7.8

2008

7.3

2015

7.9

2013

7.7

1999

6.6

1995

8.0

1985

8.3

1992

6.8

2002

7.1

1961

7.2

2014

7.7

2004

7.0

2007

7.2

1985

7.7

2013

6.5

2005

6.9