1977

7.3

2007

10.0

2013

7.6

7.8

1995

5.2

2015

6.7

2012

7.5

1895

5.6

2017

6.8

2007

7.2

5.7

1895

4.8

2003

6.9

1993

6.1

2014

4.5

1968

6.5

2008

6.1

1969

6.9

2019

6.4

2021

5.5