1980

5.6

1981

5.2

1999

7.3

2013

7.0

1980

3.6

1981

5.0

2012

0.0

1971

8.1

1984

4.7

1980

4.7

1999

6.0

1987

6.5

2001

6.4

1982

4.0

2010

6.1

1977

6.5

1978

7.2

1974

0.0

1997

4.0

1993

7.2

1993

6.1

1983

6.5

1976

6.7

1990

7.4

2010

3.7

1985

0.0

1989

7.0

2002

5.6