2004

7.2

2019

6.3

2015

7.6

2013

7.5

2009

8.3

2008

7.6

1987

7.7

1985

7.9

1995

6.9

1982

7.3

2000

6.9

2010

8.0

2009

7.9

2016

7.6

2009

7.7

2013

7.1

2008

7.6

2000

8.0

2019

8.5

2006

6.9