1970

6.7

1984

4.7

1946

6.9

1977

5.6

1997

4.6

2015

5.6

1975

6.7

2007

3.6

1973

4.2

2013

6.3

1957

6.9

2012

5.0

2020

5.7

2003

8.2

1966

6.1

1975

6.9

1996

2.0

2001

7.2

2005

6.2

2007

6.0