1985

7.3

2020

4.7

2010

6.4

1999

5.9

2005

5.4

2015

7.3

1968

6.9

2012

7.7

2013

6.8

2013

7.2

2024

5.7

2023

6.4

1898

6.0

2014

4.9

1966

6.5

2006

7.8

1972

6.2

2010

7.3

1986

5.8

2008

6.2