2005

7.1

2011

6.6

2001

7.7

2004

7.3

2013

5.2

1991

6.8

1984

7.0

2010

7.6

2006

7.5

2007

7.4

1984

6.3

2024

6.1

1954

6.8

1989

5.7

1974

7.0

1965

5.7

1979

6.7

1969

4.4

1961

6.4

1997

6.2