1972

6.3

2002

6.2

2013

3.8

2003

6.5

1971

7.1

2002

7.6

2002

3.9

1993

6.6

2008

6.7

2006

6.7

1972

6.5

2003

4.1

2005

5.7

2002

6.3

2006

6.8

2001

6.6

2004

6.4

2004

6.4

1991

7.1

1995

7.1