1993

5.5

2005

7.7

1993

5.8

2002

5.2

1980

6.7

2007

4.9

2010

6.8

2012

6.8

2014

6.7

2010

7.5

1943

6.4

1997

4.4

1999

5.1

2004

6.6

2002

5.8

2003

8.5

1997

7.2

2001

6.2

1995

7.3

1970

6.0