2015

6.2

1990

7.0

2005

6.5

2001

6.8

1998

6.8

2006

6.7

2003

7.2

1998

6.2

2002

6.5

2008

6.5

1992

6.6

1983

7.4

1995

7.3

1993

7.3

2007

4.5

2002

6.1

1994

7.3

1981

7.3

2014

6.3

1994

0.0