2006

6.4

2005

6.2

2018

6.9

1976

6.0

1997

6.2

2008

4.0

2019

6.8

2006

6.2

2019

7.9

2007

7.4

2002

4.7

1968

7.4

2008

4.0

1950

7.1

2009

5.7

1953

6.0

1956

6.5

1957

3.6

1995

6.9

2001

7.7