1995

7.7

2009

6.1

1993

6.8

1990

6.1

1989

5.8

1989

7.2

2005

7.7

2008

8.5

2010

7.1

2009

6.4

1980

6.2

2010

5.8

1919

1.0

2018

3.0

2012

7.8

1998

5.9

1988

6.2

1957

8.2

2020

5.2

2013

6.4