2004

8.6

1992

5.8

5.8

2001

7.8

2004

8.3

1996

5.4

1993

6.7

2001

6.6

1990

6.9

2000

6.0

1972

7.9

2014

7.1

2011

7.5

2016

8.0

2004

7.9

1997

8.1

2013

8.0

2005

7.3

1999

8.7

2012

7.4