2006

7.1

1999

7.8

2003

7.2

2001

6.7

2006

6.3

2017

6.0

1990

6.0

1990

4.2

1960

6.1

2005

6.8

1994

7.0

2014

6.4

2014

5.0

2007

1.0

2009

6.3

1981

5.5

1973

5.6

1976

4.8

1974

4.8

1997

6.3