2013

6.7

2010

8.2

1995

7.2

1968

8.1

2001

8.4

1994

8.5

2014

8.5

1990

8.5

2014

6.1

2013

6.9

2008

7.7

1997

7.9

2008

7.6

2015

7.6

2002

7.5

1989

8.3

1999

8.0

2017

7.3

2011

7.2

2013

7.2