2014

3.9

1987

7.6

1990

8.5

1980

7.9

2007

7.9

2004

7.5

2006

7.9

2007

7.4

2014

5.8

1988

6.0

2017

6.0

2005

7.0

1996

5.3

1971

7.0

1999

6.4

1970

7.5

1997

6.6

1994

6.8

2009

6.7

2019

7.2