2001

6.1

1999

7.2

2006

7.1

1993

5.5

2020

6.7

2010

8.0

5.5

2002

4.7

2008

7.4

2007

7.1

2009

7.9

2017

6.9

2014

7.8

1972

6.2

2015

4.6

1959

5.3

2013

7.6

1990

6.9

1982

7.6