2004

7.6

2008

8.5

1968

8.1

2015

7.6

2016

5.9

2010

5.8

2014

8.4

1997

7.9

1962

7.0

1990

7.2

2013

8.0

1982

7.9

2009

7.0

1978

7.6

2015

5.9

2000

6.0

1989

7.0

1977

6.6

1983

7.1

2007

6.3