1985

7.7

1987

7.1

2017

0.0

1985

0.0

2005

6.5

1979

7.8

1997

4.9

2007

5.6

2002

3.2

1979

0.0

2008

6.7

1991

5.7

2010

7.7

1981

7.0

1988

7.0

2000

6.4

2008

6.1

1989

6.2

1970

6.6

2002

6.1