1990

6.6

1998

6.0

1995

7.8

2007

5.8

2016

6.3

2012

5.5

2009

5.6

1923

6.8

1938

7.5

1963

6.9

2018

6.7

1993

6.3

1987

7.6

1976

7.5

1961

7.3

1980

6.7

2017

6.2

1987

6.8

1953

7.2

2016

9.7