1980

6.6

2009

6.6

1970

7.2

2016

3.3

1997

6.1

1991

5.3

1969

6.6

1996

6.4

1964

7.1

2011

10.0

1970

0.0

1988

6.3

2005

4.0

2001

7.3

1966

5.8

1937

6.9

2003

5.9

2002

6.4

2002

6.8

2013

8.5