2000

6.3

1987

6.0

2007

4.9

1996

6.1

2011

5.7

1986

6.0

1995

6.2

2008

7.0

1985

6.5

2004

6.6

1937

7.1

2006

6.1

1997

5.3

2009

7.4

1967

6.7

1990

7.3

1989

6.1

1951

7.3

2023

6.6

1998

6.9