1985

7.0

1975

6.6

2009

6.7

2009

6.9

2002

6.0

2005

5.9

2005

6.2

2007

6.1

1965

7.2

2007

7.5

1995

6.4

2014

6.1

1973

5.2

2017

6.0

2021

5.4

2022

7.0

1978

7.1

1982

6.9

1969

7.6

1988

6.1