1998

7.2

2013

8.2

1996

6.3

1992

5.6

1977

7.4

1996

5.4

2004

8.6

2005

8.1

2013

6.7

2005

7.5

1969

5.1

2007

5.0

1970

6.4

2006

0.0

1998

5.6

1972

6.2

2001

8.0

1992

6.0

2011

6.7

1999

7.7

1971

6.4