1965

5.5

2006

7.6

2015

7.5

2017

5.5

2006

7.2

2008

6.4

1976

6.3

2025

6.3

2004

6.3

2001

5.2

2007

6.2

2016

6.9

1999

7.0

2000

6.0

2006

5.9

1959

7.9

1960

7.5

2007

5.7

1949

5.0

2002

6.3