2005

5.3

2006

5.7

2004

6.1

1976

7.0

2010

0.0

1997

6.7

2001

6.2

1993

6.0

2013

6.2

1988

7.1

2000

7.2

1999

7.5

2007

7.6

2015

7.0

1980

6.8

2007

6.5

2007

5.4

1965

7.8

1994

7.4

2004

0.0