1960

4.8

2017

5.6

2007

5.4

2007

6.3

2023

0.0

1979

6.1

1990

7.3

2021

6.8

1988

4.9

1960

7.5

2005

7.2

2004

8.0

1998

7.3

1993

7.6

2006

6.9

1976

7.8

2014

4.6

0.0

2009

6.5

2010

6.7