1997

6.1

2009

6.6

1964

7.1

2005

6.3

1970

0.0

1988

6.3

2013

8.5

1984

6.5

1980

6.0

2003

5.9

2005

5.3

1979

7.2

2002

6.8

1981

6.8

1992

7.5

2016

3.3

2001

7.3

2005

4.0

1970

7.2

1996

6.4