2009

4.8

2004

4.7

2006

6.7

1999

5.3

2005

5.1

2003

4.9

2001

5.9

2002

5.2

1966

7.0

1994

5.7

2008

5.1

2010

5.1

1998

5.1

2020

5.5

1997

5.1

2016

6.5

2010

4.4

2020

6.0

2006

5.0

1993

7.6