2002

6.3

2010

6.3

2003

7.3

2008

6.7

1998

6.4

1987

6.5

2012

6.9

1982

7.1

1963

7.1

1997

6.6

2016

5.7

1973

6.8

2000

7.2

2007

7.2

1962

7.3

1979

6.2

2000

7.7

1976

6.7

2017

6.8

1974

6.5