2003

7.2

1998

8.1

1994

8.7

2014

8.5

2012

8.2

2012

7.2

1999

8.4

2012

6.4

2006

7.9

2005

7.7

2017

7.3

2008

7.6

1994

8.5

2014

7.4

2002

7.3

1994

8.3

1971

8.2

2000

7.7

2008

8.5

2008

7.4