1996

6.3

1997

6.8

1993

6.9

1996

6.9

2004

6.4

2003

7.5

2007

6.4

1997

6.2

1995

7.3

1990

6.4

2004

5.7

1977

5.6

1974

7.0

1958

7.2

2006

7.1

2007

5.1

1929

6.0

2017

6.0

2002

7.3

1995

7.5