2008

6.1

2003

5.9

1993

5.3

2002

7.7

1985

8.1

2012

6.3

2010

5.2

1998

6.8

2000

5.5

2014

5.0

1973

7.4

2009

5.5

2016

7.0

2009

5.3

2012

6.9

1989

5.1

2005

5.3

2007

5.9

2007

5.9

1994

6.0