1970

4.7

1962

6.2

1963

6.2

1976

4.5

1968

3.7

1967

5.5

1974

6.0

1941

4.3

1961

6.7

1964

6.5

2008

4.9

1986

6.5

2013

4.8

2013

5.1

2003

8.0

2014

4.7

2014

6.1

2012

4.7