1981

6.9

1988

5.3

1976

4.8

2005

6.3

1986

6.3

1982

6.4

1987

5.3

1980

4.3

1997

5.1

1996

5.5

2009

0.0

1984

5.9

1992

6.8

1995

5.8

2000

5.1

1973

3.1

2003

4.9

1987

4.9

2013

3.2

1999

7.3