1993

5.1

2003

4.9

1998

8.2

1989

6.7

1971

8.1

1994

6.3

2004

7.4

2003

7.2

1994

7.4

1992

3.0

2007

5.0

2005

6.2

1996

7.0

1999

8.3

1998

5.0