2002

6.6

1984

7.1

1988

7.5

1979

7.5

2007

6.7

2007

6.2

2011

6.2

1985

7.7

2013

6.5

1988

6.5

1965

7.6

1999

5.9

1982

5.9

1999

7.6

1985

6.5

2000

5.5

2003

5.7

1998

6.8

2008

6.4

2014

6.3