2006

6.2

1993

6.4

2001

7.0

1964

6.8

2005

6.2

1997

6.2

2004

7.1

1999

6.1

2009

6.6

2023

6.5

2016

5.8

1998

7.2

2007

6.9

2017

6.0

2023

6.4

2002

6.2

1966

5.2

2002

6.7

1975

6.3

1931

6.8