1973

3.7

2006

6.2

1970

3.8

1993

5.4

2007

6.4

2006

6.3

2012

6.0

2001

7.4

1991

5.9

1996

7.0

1977

4.6

2004

5.3

2023

0.0

1991

4.5

2003

6.6

1966

2.5

2017

6.3

2023

0.0

1978

6.0

1975

7.5