1989

0.0

1994

6.2

1997

7.2

1975

4.1

1990

6.1

1986

6.2

2005

8.3

1988

6.9

1999

8.0

1993

6.9

1993

6.9

2005

8.1

2019

7.7

2005

8.2

2000

5.3

1995

7.3

1997

5.4

2010

7.9

1992

6.7

2003

7.6

2009

7.5

1998

5.6

1993

6.8

2000

4.5

1993

7.9

2013

7.0

1989

6.3

2002

7.3

1975

0.0