2006

6.1

1995

5.6

2015

6.6

2007

4.7

1972

7.3

1985

7.0

1978

5.9

1978

6.8

2016

6.1

1993

6.5

1994

6.2

2010

6.1

1971

6.0

1998

7.2

1988

6.3

2008

7.0

1976

7.5

2017

5.4

1980

5.9

1967

4.3