1970

3.9

1991

4.6

2007

6.4

2006

6.3

2001

7.4

1991

5.9

1996

7.0

2004

5.3

2022

5.6

2017

6.1

2010

5.1

1975

7.4

1978

6.0

2011

6.6

1977

4.5

2000

4.6

1973

3.5

2023

0.0

2021

4.6

2003

6.6