1983

0.0

2000

7.6

2004

7.9

1994

7.8

2007

5.7

2013

6.0

1998

5.4

1992

5.8

2013

3.7

1991

7.4

2003

7.2

1993

3.7

2000

6.8

1989

8.0

1999

8.0

2017

0.0