1982

7.1

2007

6.1

1994

5.7

2009

5.4

1976

7.0

1996

6.4

1992

0.0

1972

0.0

1984

6.3

1972

6.2

2001

3.5

1999

5.7

1999

5.7

1989

7.4

1985

6.5

1996

3.7

1955

7.1

1983

7.1

2009

5.8

2002

4.8