1950

4.6

1951

5.3

1967

5.0

1952

5.2

1954

4.2

2016

6.7

1986

7.7

2006

6.6

1981

7.2

1954

7.6

1955

6.0

1961

5.0

1996

4.3

2015

6.3

2003

6.2

1952

7.4

1973

6.1

1933

7.6

2005

6.9

1995

0.0