2004

3.7

2020

6.1

2001

7.0

1969

8.1

2009

5.7

2008

5.6

1998

7.0

2002

6.7

2012

7.8

2011

8.3

2013

7.2

2001

8.5

2002

7.1

2012

7.4

2007

7.3

1990

7.5

1997

7.9

2002

6.4

2004

8.1

2012

7.3