1998

7.2

2017

7.3

1995

8.1

2015

6.8

2004

7.3

2006

6.2

2017

6.4

2013

7.5

1992

5.8

2016

7.1

1972

7.7

2010

8.1

2004

8.3

2009

6.6

2004

7.5

1999

7.5

2016

6.2

2004

7.7

2008

6.7