2007

6.4

2006

6.3

1991

5.9

2006

7.6

2001

7.4

1997

6.1

1996

7.0

1991

7.7

1970

3.8

1980

6.4

1973

3.5

2021

6.3

2015

7.5

2023

7.8

1992

7.1

1967

6.9

2022

4.8

1971

5.5

2018

2.7

1999

6.8