2000

6.3

1998

6.4

1988

6.5

2002

7.1

2009

6.1

1990

6.1

2003

6.2

2013

7.9

2005

6.8

1980

8.4

1943

8.2

1999

7.3

1994

7.5

1987

7.5

2009

7.4

1952

8.3

2004

7.3

2004

6.6

2006

7.9

2009

6.5