1997

7.5

2001

8.2

2014

6.6

2013

7.5

1970

7.5

2010

6.5

2006

7.5

1994

8.2

1998

7.1

2005

8.0

1982

7.2

2013

0.0

1989

5.8

2004

6.9

2002

6.4

1993

7.6

1969

8.2

2000

8.1

2002

8.1

2012

0.0