1984

7.8

2007

7.0

2015

7.2

1985

6.4

2000

8.0

1992

7.0

1998

5.8

2008

0.0

1991

6.6

2004

7.7

2006

7.4

1999

7.9

2013

7.3

2006

7.6

2006

8.1

1999

6.8

2011

7.3

1988

6.2