1992

6.7

1993

6.1

2002

10.0

2017

8.2

2011

7.0

2009

9.7

2014

9.0

1968

8.0

2003

7.1

1983

7.3

1982

7.8

1982

7.2

2007

6.4

1993

6.9

2002

5.9

1999

6.0

1994

7.3

2005

5.1

2002

6.0

2005

7.1