1973

6.0

2015

7.8

2004

5.9

1968

3.5

1986

6.9

1986

6.1

2006

7.2

1952

6.7

1987

6.8

2007

6.2

1968

7.6

1973

6.0

1996

6.0

1995

7.0

2003

7.1

1999

7.5

1932

6.9

2000

7.0

2002

7.2

2005

6.8