2013

5.5

2014

6.1

2013

4.9

2008

5.2

1993

7.6

1990

7.4

1992

6.8

1985

6.2

1972

6.3

1975

5.5

1969

6.6

2013

4.5

2018

0.0

2001

5.7

2006

6.0

2013

5.6

2013

6.0

2006

7.2

1950

7.1

2008

5.6