2005

6.2

2015

7.4

2004

7.3

1998

7.1

2012

7.4

1981

7.1

1999

7.9

2009

7.7

1996

6.8

2010

7.5

2000

8.0

1971

8.1

2006

7.3

2015

7.4

1997

7.3

2005

7.5

1968

5.7

2024

7.0

2019

6.9

2008

6.7