2006

6.7

1987

7.7

2007

4.8

1979

5.2

1985

6.7

1981

7.2

2009

6.2

2005

4.3

2009

7.8

1956

7.1

2002

6.6

1972

0.0

1972

0.0

1998

6.9

2014

6.1

2003

6.1

2000

7.4

2007

5.3

1990

6.4

1987

7.1