1986

6.1

2002

6.8

1964

7.1

1980

6.6

2014

6.7

1994

7.5

2009

6.6

1996

6.4

1992

7.4

1970

7.1

2007

4.0

1997

5.9

2005

5.3

2003

5.9

2017

6.9

1988

6.3

2005

6.3

1983

0.0

2017

1.0

2001

5.4