1966

6.5

2009

5.0

2023

6.6

1971

6.4

1970

8.2

2020

6.8

2018

6.7

2013

7.0

2018

5.7

2007

4.9

2001

6.3

1984

5.4

2007

6.7

1989

7.9

1982

5.8

1991

5.3

2006

8.0

1997

6.0

1993

6.3