2001

7.6

1996

6.8

1994

8.4

2009

7.9

2008

8.9

2001

7.8

1993

7.9

2001

8.0

1995

7.8

2000

8.0

2011

8.3

2017

8.1

1990

6.9

1988

6.8

2007

7.6

2004

8.2

1998

7.1

2018

7.3

1965

7.9

2006

7.7