1976

5.1

1977

5.4

1967

5.1

1994

4.5

2005

3.5

1966

3.7

1985

3.9

1914

5.6

1948

5.0

1996

4.0

2009

6.0

1988

6.6

1998

6.4

2009

6.2

1971

7.0

1985

6.5

2011

6.2

2016

4.5

2019

0.0

2018

0.0