1989

5.8

1990

4.4

2017

5.9

1988

5.5

2010

6.6

2011

5.6

2016

6.0

2009

7.5

2019

7.6

2020

6.7

2021

6.6

2008

5.6

2019

5.4

2007

5.7

1898

7.2

2009

6.2

1979

7.3

1997

6.2

1972

7.4