1972

6.3

2009

5.9

2013

6.0

2006

6.5

2004

6.1

2008

7.5

1986

5.6

1971

7.6

1992

4.7

2015

4.9

1961

6.6

1981

6.1

1987

5.7

2023

7.0

1998

6.6

2002

5.7

2004

6.5

1995

6.5

2000

3.0

2009

6.5