1973

6.8

1972

6.8

1996

4.1

1987

6.5

1986

6.3

2008

7.0

1969

5.3

1968

6.0

2019

6.6

1967

6.4

1987

7.6

2010

6.2

2010

8.1

1995

6.9

1985

7.5

2018

6.3

1980

8.4

2019

7.4

1994

8.5

2023

6.2