2001

6.8

1997

4.5

2006

7.5

2005

6.8

1984

4.8

2009

5.0

1957

6.3

0.0

1992

6.2

1994

5.6

2000

4.9

1990

6.5

2007

6.5

2014

6.0

2019

7.0

1956

7.9

1989

7.0

1992

6.7

1998

6.6

2006

6.7