2005

5.9

1966

6.5

2004

5.7

1999

7.6

2003

4.1

2008

5.2

2008

4.5

2016

5.0

6.1

1995

5.2

1994

5.3

1993

5.4

1969

7.0

2007

7.3

2011

7.5

2012

4.7

2014

5.7

1992

6.2

1978

6.4

2013

6.7