2007

6.8

2017

3.9

1993

6.1

2007

6.0

2014

4.0

1964

5.9

1979

7.0

1984

6.9

1988

7.3

2009

6.2

2005

6.1

2006

5.6

1999

5.6

1959

5.6

2008

6.7

2000

4.3

2000

6.6

2005

6.7

1992

6.4

1997

6.2