2001

7.6

2007

7.7

2000

8.1

2004

7.4

1997

7.5

1989

7.5

2004

8.0

2016

8.0

2003

7.9

2018

7.7

1998

8.5

2017

7.4

2018

7.0

2011

7.6

2002

8.3

2011

8.4

2005

8.1

1995

8.6

2003

8.2