1998

0.0

1972

8.1

2015

5.5

2000

6.5

1991

10.0

2017

9.0

1987

6.2

1985

8.2

1989

7.3

2003

7.5

2002

7.3

2003

8.0

2004

7.1

1999

6.0

2006

7.2

2001

6.9

2006

4.8

2004

7.2

1980

7.7

2016

6.6