1980

10.0

1985

5.2

2005

7.1

2017

5.6

1965

7.5

2006

7.0

1993

6.1

2010

2.0

1990

6.5

1970

7.2

1996

0.0

2000

5.4

2005

0.0

1991

5.8

1997

10.0

1996

8.5

1992

7.5

2005

6.2

1988

7.0

2003

6.0