2005

5.9

2003

5.7

1979

6.7

1989

6.2

1996

5.4

2007

4.9

1999

5.8

1994

6.5

2003

6.2

2006

7.8

2004

6.2

2005

7.3

2012

7.0

1984

6.5

1998

6.5

2013

6.7

2003

7.8

1995

5.4

2003

4.1

2011

6.1