1995

5.9

2009

5.3

2004

6.0

2011

6.2

2010

6.8

2019

6.5

2005

8.3

2009

5.6

2015

6.4

1983

6.5

2009

6.3

2007

5.6

1990

7.5

1993

5.4

1972

8.7

1995

5.6

1980

6.4

2015

4.4

1949

6.2

2016

6.1