1985

7.1

1989

7.1

2001

6.4

1997

6.8

2006

5.6

2017

7.8

2007

7.0

1993

7.0

1967

5.9

1966

6.5

1964

6.6

1965

6.3

2007

5.3

1963

7.7

2004

6.9

1970

6.1

1975

6.3

2021

0.0

2020

0.0

1983

7.3