6.8

1895

5.5

2019

7.5

2011

6.9

2021

7.8

2009

6.6

2006

6.7

1974

6.3

1984

6.3

1990

7.5

1982

5.7

1968

6.5

2017

5.9

2017

7.3

2016

5.3

1987

6.2

6.8

2003

6.0

1996

7.0

2013

6.6