2004

7.1

1990

7.5

2002

7.4

2012

5.8

2000

6.4

2010

6.3

2005

6.8

2008

5.8

1988

5.7

1966

6.3

2011

6.9

2001

6.7

1999

6.3

2002

5.8

2016

6.7

2004

6.6

2013

7.3

1971

6.8

1988

5.3

1988

6.7