1964

7.8

2014

6.8

2007

4.1

2001

6.2

2008

7.2

2006

3.7

1992

6.7

1992

6.8

2014

5.2

2008

6.3

1991

5.6

1990

6.6

1998

6.7

1980

7.1

2007

6.1

1990

6.7

1995

0.0

1943

6.4

1997

6.4

2005

6.6