1967

7.6

2002

8.0

1984

7.1

2012

1.0

2006

5.4

2015

0.0

2015

6.5

1973

5.9

2014

5.2

1983

7.3

1983

6.0

1969

8.2

1987

7.5

1984

7.2

2005

7.7

2003

8.1

2006

9.0

1990

7.0

1967

7.7

2007

7.4