2003

7.4

2002

6.6

1997

7.7

1989

7.8

2001

7.2

1990

6.3

2002

7.3

1990

7.5

1998

6.4

1984

7.7

2006

7.5

2017

5.9

1993

0.0

2002

6.3

2001

6.8

2006

6.8

1994

7.5

2009

6.1

2004

7.1

2018

5.0