1995

7.3

2004

9.5

2006

7.1

1993

7.3

2012

7.0

2016

7.1

2017

8.0

7.2

1972

7.7

2002

7.6

2012

8.1

1978

9.7

2007

6.5

2008

7.4

2005

7.6

2011

7.3

2014

6.9

1980

7.1

2019

8.4

2016

7.7