1977

4.7

2007

6.8

1978

7.2

1995

5.1

2004

6.0

1995

6.5

2002

5.6

2010

6.6

1999

5.5

1943

6.5

1991

6.7

2008

6.6

2003

6.3

1971

6.2

1993

7.4

2021

7.2

1961

6.0

1978

6.2

1992

6.2

2003

7.0