2005

6.6

1998

6.6

2016

5.7

2017

2.7

2007

6.1

2000

6.7

1999

5.4

1997

6.3

2007

6.2

1967

7.6

2004

6.0

2001

6.8

1998

6.4

1997

6.5

1999

5.2

1996

6.2

2006

7.0

2003

7.2

1995

7.0

2016

6.9