2014

8.5

2011

8.2

2001

7.6

2013

7.5

2003

7.3

2005

7.0

2013

8.0

1981

7.9

1976

7.8

1994

8.4

2000

6.9

2005

7.1

2003

8.0

2019

8.7

1990

7.6

1999

7.4

2014

8.1

2009

7.6

2010

7.8

2004

8.2