2003

7.7

2007

7.7

2007

7.9

1997

5.6

2005

6.7

2003

7.9

1999

6.0

2006

8.1

2001

0.0

1990

7.1

2014

6.2

2013

8.2

2012

8.5

1998

7.6

2014

8.1

2013

0.0

1950

7.0

2010

6.9

2004

7.6

1986

6.2