1985

5.9

2009

5.7

1991

7.3

1995

7.3

2002

6.6

2004

6.4

2005

6.7

1976

6.5

1999

7.1

1981

7.1

1973

5.7

1966

7.1

2022

7.0

1987

3.2

1970

6.1

1971

6.4

1972

6.2

2001

0.0

2020

6.4

2012

2.0