1999

7.2

1994

8.3

2012

7.1

1988

7.4

1999

8.4

1994

8.7

2017

7.8

2019

8.1

2008

8.5

2013

8.0

2014

7.9

2008

8.0

2015

7.2

2009

7.6

2011

6.7

2001

8.5

2007

7.3

2012

6.6

1995

8.4

2009

8.2