1996

6.3

1988

6.4

1995

8.1

2001

6.6

1991

6.9

1990

8.0

2017

10.0

2007

0.0

1999

7.9

1984

0.0

1981

8.1

2003

8.1

2003

7.5

2004

7.0

2006

7.6

1997

8.3

2003

7.2

1997

8.4

2000

7.6

2013

7.4