1987

7.0

2009

6.1

2014

7.4

2014

6.1

1989

7.3

1992

6.3

1996

5.6

1992

0.0

2003

6.0

2001

5.4

2006

0.0

2003

9.0

1999

6.5

1977

2.0

2003

10.0

1972

5.5

1971

5.2

1971

4.8

1997

4.5

1973

6.8