1963

7.8

2020

7.7

2013

8.0

2014

7.3

1998

7.2

2007

6.3

2011

6.0

2012

7.3

2013

7.3

2002

5.3

1990

7.9

1993

7.7

2012

6.3

1985

7.5

2009

8.0

2001

6.9

2002

7.3

1988

7.5

2012

6.6

2018

7.7