2009

7.2

2010

7.9

2005

7.2

2017

7.3

1990

7.6

2012

6.7

5.8

1997

8.3

1984

8.5

1995

7.8

2013

7.8

1998

7.2

2009

6.6

2004

8.3

2015

7.1

1999

7.0

2009

6.6

2011

7.5

1991

7.9

2006

7.5