2011

7.6

2014

6.6

2007

6.5

2004

6.7

1993

6.6

1943

6.4

2000

7.3

2003

6.1

1991

7.2

1988

5.8

1966

7.6

1982

6.0

2009

6.3

2001

6.2

1976

6.5

1968

6.9

1990

4.4

2004

6.0

1987

4.5