1997

0.0

1990

7.4

1994

6.7

2001

7.2

2021

6.3

1987

4.0

1996

8.1

2007

6.6

1984

6.0

1995

7.3

1986

7.0

2005

7.5

1999

6.0

1999

6.5

2009

3.5

1997

6.1

1982

0.0

1996

4.9

1981

5.0