2015

6.4

1961

7.2

2001

6.1

1996

7.6

2013

6.8

2003

7.1

2003

7.0

1980

7.3

1994

6.5

2000

7.7

2007

6.7

2010

5.8

2013

6.2

2002

5.7

2002

5.8

2012

6.9

1964

7.5

1990

7.0

2008

6.5

1997

7.1