1982

6.7

1979

6.5

1986

7.1

1958

8.2

2009

6.1

1947

6.1

1961

6.1

1997

5.3

1979

6.8

2019

7.3

1990

6.0

1997

5.7

2003

6.5

2004

5.9

1996

7.1

2005

6.2

1997

5.6

1976

6.7

2005

7.0

1974

6.1