2007

7.0

2000

6.3

2005

7.0

1980

6.6

1982

6.4

2001

5.4

1968

7.3

1962

7.2

2004

7.1

2002

7.4

1958

7.4

1964

7.6

2004

6.3

2002

6.3

2004

6.1

1979

2.3

1988

6.7

2003

6.0

2004

6.8

2005

5.9