1953

2.7

2000

7.7

1993

6.4

2014

6.8

1999

7.5

1961

7.2

2005

6.9

2012

6.7

2011

7.1

2012

6.3

2013

6.1

2010

6.3

2020

5.2

1990

5.8

2004

6.3

1948

7.0

2012

5.2

1995

5.4

2007

5.9

2002

6.0