2015

6.1

1985

8.3

1990

7.7

2007

7.2

2005

6.7

2009

7.4

1994

7.0

2001

7.8

2010

7.6

2002

7.4

1982

7.9

2008

8.5

1995

6.9

2001

7.8

2005

7.0

1995

8.0

2008

8.1

1994

8.5

2013

6.2

2001

8.5