1977

6.8

1994

6.9

1998

7.1

2006

5.0

2005

5.9

1980

6.1

1996

6.3

2007

6.0

1987

6.4

1955

7.0

1983

6.7

2004

6.5

2022

6.5

1992

7.5

1925

5.6

2007

5.0

1999

6.1

1973

7.9

2015

6.1

2016

6.1