1997

7.0

1972

4.1

2011

7.0

1988

0.0

2007

4.0

2004

7.4

1996

7.6

1999

4.0

1983

6.3

1980

5.2

2011

7.5

1984

6.7

2008

5.9

2001

7.3

2006

7.2