2003

6.9

2006

6.7

2015

7.5

10.0

1999

5.3

1983

7.0

1998

0.0

1997

6.8

1991

7.1

1972

7.3

1988

6.6

1997

6.6

2003

7.1

1998

8.1

2007

7.8

1970

4.4

2007

6.1

1988

7.1

1987

7.2

2002

6.1