2012

5.2

1953

5.4

1981

7.2

2000

7.1

2013

7.9

2010

6.2

1952

6.6

2005

5.8

1993

6.8

1997

6.9

1952

6.7

1986

6.3

1978

6.4

1958

6.6

2007

6.7

1987

6.5

1999

5.7

1995

6.8

1990

7.0